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/wp-includes/ -> post.php (source)

   1  <?php
   2  /**
   3   * Core Post API
   4   *
   5   * @package WordPress
   6   * @subpackage Post
   7   */
   8  
   9  //
  10  // Post Type registration.
  11  //
  12  
  13  /**
  14   * Creates the initial post types when 'init' action is fired.
  15   *
  16   * See {@see 'init'}.
  17   *
  18   * @since 2.9.0
  19   */
  20  function create_initial_post_types() {
  21      register_post_type(
  22          'post',
  23          array(
  24              'labels'                => array(
  25                  'name_admin_bar' => _x( 'Post', 'add new from admin bar' ),
  26              ),
  27              'public'                => true,
  28              '_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
  29              '_edit_link'            => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
  30              'capability_type'       => 'post',
  31              'map_meta_cap'          => true,
  32              'menu_position'         => 5,
  33              'menu_icon'             => 'dashicons-admin-post',
  34              'hierarchical'          => false,
  35              'rewrite'               => false,
  36              'query_var'             => false,
  37              'delete_with_user'      => true,
  38              'supports'              => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'comments', 'revisions', 'post-formats' ),
  39              'show_in_rest'          => true,
  40              'rest_base'             => 'posts',
  41              'rest_controller_class' => 'WP_REST_Posts_Controller',
  42          )
  43      );
  44  
  45      register_post_type(
  46          'page',
  47          array(
  48              'labels'                => array(
  49                  'name_admin_bar' => _x( 'Page', 'add new from admin bar' ),
  50              ),
  51              'public'                => true,
  52              'publicly_queryable'    => false,
  53              '_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
  54              '_edit_link'            => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
  55              'capability_type'       => 'page',
  56              'map_meta_cap'          => true,
  57              'menu_position'         => 20,
  58              'menu_icon'             => 'dashicons-admin-page',
  59              'hierarchical'          => true,
  60              'rewrite'               => false,
  61              'query_var'             => false,
  62              'delete_with_user'      => true,
  63              'supports'              => array( 'title', 'editor', 'author', 'thumbnail', 'page-attributes', 'custom-fields', 'comments', 'revisions' ),
  64              'show_in_rest'          => true,
  65              'rest_base'             => 'pages',
  66              'rest_controller_class' => 'WP_REST_Posts_Controller',
  67          )
  68      );
  69  
  70      register_post_type(
  71          'attachment',
  72          array(
  73              'labels'                => array(
  74                  'name'           => _x( 'Media', 'post type general name' ),
  75                  'name_admin_bar' => _x( 'Media', 'add new from admin bar' ),
  76                  'add_new'        => _x( 'Add New', 'add new media' ),
  77                  'edit_item'      => __( 'Edit Media' ),
  78                  'view_item'      => __( 'View Attachment Page' ),
  79                  'attributes'     => __( 'Attachment Attributes' ),
  80              ),
  81              'public'                => true,
  82              'show_ui'               => true,
  83              '_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
  84              '_edit_link'            => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
  85              'capability_type'       => 'post',
  86              'capabilities'          => array(
  87                  'create_posts' => 'upload_files',
  88              ),
  89              'map_meta_cap'          => true,
  90              'menu_icon'             => 'dashicons-admin-media',
  91              'hierarchical'          => false,
  92              'rewrite'               => false,
  93              'query_var'             => false,
  94              'show_in_nav_menus'     => false,
  95              'delete_with_user'      => true,
  96              'supports'              => array( 'title', 'author', 'comments' ),
  97              'show_in_rest'          => true,
  98              'rest_base'             => 'media',
  99              'rest_controller_class' => 'WP_REST_Attachments_Controller',
 100          )
 101      );
 102      add_post_type_support( 'attachment:audio', 'thumbnail' );
 103      add_post_type_support( 'attachment:video', 'thumbnail' );
 104  
 105      register_post_type(
 106          'revision',
 107          array(
 108              'labels'           => array(
 109                  'name'          => __( 'Revisions' ),
 110                  'singular_name' => __( 'Revision' ),
 111              ),
 112              'public'           => false,
 113              '_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
 114              '_edit_link'       => 'revision.php?revision=%d', /* internal use only. don't use this when registering your own post type. */
 115              'capability_type'  => 'post',
 116              'map_meta_cap'     => true,
 117              'hierarchical'     => false,
 118              'rewrite'          => false,
 119              'query_var'        => false,
 120              'can_export'       => false,
 121              'delete_with_user' => true,
 122              'supports'         => array( 'author' ),
 123          )
 124      );
 125  
 126      register_post_type(
 127          'nav_menu_item',
 128          array(
 129              'labels'           => array(
 130                  'name'          => __( 'Navigation Menu Items' ),
 131                  'singular_name' => __( 'Navigation Menu Item' ),
 132              ),
 133              'public'           => false,
 134              '_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
 135              'hierarchical'     => false,
 136              'rewrite'          => false,
 137              'delete_with_user' => false,
 138              'query_var'        => false,
 139          )
 140      );
 141  
 142      register_post_type(
 143          'custom_css',
 144          array(
 145              'labels'           => array(
 146                  'name'          => __( 'Custom CSS' ),
 147                  'singular_name' => __( 'Custom CSS' ),
 148              ),
 149              'public'           => false,
 150              'hierarchical'     => false,
 151              'rewrite'          => false,
 152              'query_var'        => false,
 153              'delete_with_user' => false,
 154              'can_export'       => true,
 155              '_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
 156              'supports'         => array( 'title', 'revisions' ),
 157              'capabilities'     => array(
 158                  'delete_posts'           => 'edit_theme_options',
 159                  'delete_post'            => 'edit_theme_options',
 160                  'delete_published_posts' => 'edit_theme_options',
 161                  'delete_private_posts'   => 'edit_theme_options',
 162                  'delete_others_posts'    => 'edit_theme_options',
 163                  'edit_post'              => 'edit_css',
 164                  'edit_posts'             => 'edit_css',
 165                  'edit_others_posts'      => 'edit_css',
 166                  'edit_published_posts'   => 'edit_css',
 167                  'read_post'              => 'read',
 168                  'read_private_posts'     => 'read',
 169                  'publish_posts'          => 'edit_theme_options',
 170              ),
 171          )
 172      );
 173  
 174      register_post_type(
 175          'customize_changeset',
 176          array(
 177              'labels'           => array(
 178                  'name'               => _x( 'Changesets', 'post type general name' ),
 179                  'singular_name'      => _x( 'Changeset', 'post type singular name' ),
 180                  'menu_name'          => _x( 'Changesets', 'admin menu' ),
 181                  'name_admin_bar'     => _x( 'Changeset', 'add new on admin bar' ),
 182                  'add_new'            => _x( 'Add New', 'Customize Changeset' ),
 183                  'add_new_item'       => __( 'Add New Changeset' ),
 184                  'new_item'           => __( 'New Changeset' ),
 185                  'edit_item'          => __( 'Edit Changeset' ),
 186                  'view_item'          => __( 'View Changeset' ),
 187                  'all_items'          => __( 'All Changesets' ),
 188                  'search_items'       => __( 'Search Changesets' ),
 189                  'not_found'          => __( 'No changesets found.' ),
 190                  'not_found_in_trash' => __( 'No changesets found in Trash.' ),
 191              ),
 192              'public'           => false,
 193              '_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
 194              'map_meta_cap'     => true,
 195              'hierarchical'     => false,
 196              'rewrite'          => false,
 197              'query_var'        => false,
 198              'can_export'       => false,
 199              'delete_with_user' => false,
 200              'supports'         => array( 'title', 'author' ),
 201              'capability_type'  => 'customize_changeset',
 202              'capabilities'     => array(
 203                  'create_posts'           => 'customize',
 204                  'delete_others_posts'    => 'customize',
 205                  'delete_post'            => 'customize',
 206                  'delete_posts'           => 'customize',
 207                  'delete_private_posts'   => 'customize',
 208                  'delete_published_posts' => 'customize',
 209                  'edit_others_posts'      => 'customize',
 210                  'edit_post'              => 'customize',
 211                  'edit_posts'             => 'customize',
 212                  'edit_private_posts'     => 'customize',
 213                  'edit_published_posts'   => 'do_not_allow',
 214                  'publish_posts'          => 'customize',
 215                  'read'                   => 'read',
 216                  'read_post'              => 'customize',
 217                  'read_private_posts'     => 'customize',
 218              ),
 219          )
 220      );
 221  
 222      register_post_type(
 223          'oembed_cache',
 224          array(
 225              'labels'           => array(
 226                  'name'          => __( 'oEmbed Responses' ),
 227                  'singular_name' => __( 'oEmbed Response' ),
 228              ),
 229              'public'           => false,
 230              'hierarchical'     => false,
 231              'rewrite'          => false,
 232              'query_var'        => false,
 233              'delete_with_user' => false,
 234              'can_export'       => false,
 235              '_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
 236              'supports'         => array(),
 237          )
 238      );
 239  
 240      register_post_type(
 241          'user_request',
 242          array(
 243              'labels'           => array(
 244                  'name'          => __( 'User Requests' ),
 245                  'singular_name' => __( 'User Request' ),
 246              ),
 247              'public'           => false,
 248              '_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
 249              'hierarchical'     => false,
 250              'rewrite'          => false,
 251              'query_var'        => false,
 252              'can_export'       => false,
 253              'delete_with_user' => false,
 254              'supports'         => array(),
 255          )
 256      );
 257  
 258      register_post_type(
 259          'wp_block',
 260          array(
 261              'labels'                => array(
 262                  'name'                     => _x( 'Reusable Blocks', 'post type general name' ),
 263                  'singular_name'            => _x( 'Reusable Block', 'post type singular name' ),
 264                  'menu_name'                => _x( 'Reusable Blocks', 'admin menu' ),
 265                  'name_admin_bar'           => _x( 'Reusable Block', 'add new on admin bar' ),
 266                  'add_new'                  => _x( 'Add New', 'Reusable Block' ),
 267                  'add_new_item'             => __( 'Add New Reusable Block' ),
 268                  'new_item'                 => __( 'New Reusable Block' ),
 269                  'edit_item'                => __( 'Edit Reusable Block' ),
 270                  'view_item'                => __( 'View Reusable Block' ),
 271                  'all_items'                => __( 'All Reusable Blocks' ),
 272                  'search_items'             => __( 'Search Reusable Blocks' ),
 273                  'not_found'                => __( 'No reusable blocks found.' ),
 274                  'not_found_in_trash'       => __( 'No reusable blocks found in Trash.' ),
 275                  'filter_items_list'        => __( 'Filter reusable blocks list' ),
 276                  'items_list_navigation'    => __( 'Reusable Blocks list navigation' ),
 277                  'items_list'               => __( 'Reusable Blocks list' ),
 278                  'item_published'           => __( 'Reusable Block published.' ),
 279                  'item_published_privately' => __( 'Reusable Block published privately.' ),
 280                  'item_reverted_to_draft'   => __( 'Reusable Block reverted to draft.' ),
 281                  'item_scheduled'           => __( 'Reusable Block scheduled.' ),
 282                  'item_updated'             => __( 'Reusable Block updated.' ),
 283              ),
 284              'public'                => false,
 285              '_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
 286              'show_ui'               => true,
 287              'show_in_menu'          => false,
 288              'rewrite'               => false,
 289              'show_in_rest'          => true,
 290              'rest_base'             => 'blocks',
 291              'rest_controller_class' => 'WP_REST_Blocks_Controller',
 292              'capability_type'       => 'block',
 293              'capabilities'          => array(
 294                  // You need to be able to edit posts, in order to read blocks in their raw form.
 295                  'read'                   => 'edit_posts',
 296                  // You need to be able to publish posts, in order to create blocks.
 297                  'create_posts'           => 'publish_posts',
 298                  'edit_posts'             => 'edit_posts',
 299                  'edit_published_posts'   => 'edit_published_posts',
 300                  'delete_published_posts' => 'delete_published_posts',
 301                  'edit_others_posts'      => 'edit_others_posts',
 302                  'delete_others_posts'    => 'delete_others_posts',
 303              ),
 304              'map_meta_cap'          => true,
 305              'supports'              => array(
 306                  'title',
 307                  'editor',
 308              ),
 309          )
 310      );
 311  
 312      register_post_status(
 313          'publish',
 314          array(
 315              'label'       => _x( 'Published', 'post status' ),
 316              'public'      => true,
 317              '_builtin'    => true, /* internal use only. */
 318              /* translators: %s: Number of published posts. */
 319              'label_count' => _n_noop(
 320                  'Published <span class="count">(%s)</span>',
 321                  'Published <span class="count">(%s)</span>'
 322              ),
 323          )
 324      );
 325  
 326      register_post_status(
 327          'future',
 328          array(
 329              'label'       => _x( 'Scheduled', 'post status' ),
 330              'protected'   => true,
 331              '_builtin'    => true, /* internal use only. */
 332              /* translators: %s: Number of scheduled posts. */
 333              'label_count' => _n_noop(
 334                  'Scheduled <span class="count">(%s)</span>',
 335                  'Scheduled <span class="count">(%s)</span>'
 336              ),
 337          )
 338      );
 339  
 340      register_post_status(
 341          'draft',
 342          array(
 343              'label'         => _x( 'Draft', 'post status' ),
 344              'protected'     => true,
 345              '_builtin'      => true, /* internal use only. */
 346              /* translators: %s: Number of draft posts. */
 347              'label_count'   => _n_noop(
 348                  'Draft <span class="count">(%s)</span>',
 349                  'Drafts <span class="count">(%s)</span>'
 350              ),
 351              'date_floating' => true,
 352          )
 353      );
 354  
 355      register_post_status(
 356          'pending',
 357          array(
 358              'label'         => _x( 'Pending', 'post status' ),
 359              'protected'     => true,
 360              '_builtin'      => true, /* internal use only. */
 361              /* translators: %s: Number of pending posts. */
 362              'label_count'   => _n_noop(
 363                  'Pending <span class="count">(%s)</span>',
 364                  'Pending <span class="count">(%s)</span>'
 365              ),
 366              'date_floating' => true,
 367          )
 368      );
 369  
 370      register_post_status(
 371          'private',
 372          array(
 373              'label'       => _x( 'Private', 'post status' ),
 374              'private'     => true,
 375              '_builtin'    => true, /* internal use only. */
 376              /* translators: %s: Number of private posts. */
 377              'label_count' => _n_noop(
 378                  'Private <span class="count">(%s)</span>',
 379                  'Private <span class="count">(%s)</span>'
 380              ),
 381          )
 382      );
 383  
 384      register_post_status(
 385          'trash',
 386          array(
 387              'label'                     => _x( 'Trash', 'post status' ),
 388              'internal'                  => true,
 389              '_builtin'                  => true, /* internal use only. */
 390              /* translators: %s: Number of trashed posts. */
 391              'label_count'               => _n_noop(
 392                  'Trash <span class="count">(%s)</span>',
 393                  'Trash <span class="count">(%s)</span>'
 394              ),
 395              'show_in_admin_status_list' => true,
 396          )
 397      );
 398  
 399      register_post_status(
 400          'auto-draft',
 401          array(
 402              'label'         => 'auto-draft',
 403              'internal'      => true,
 404              '_builtin'      => true, /* internal use only. */
 405              'date_floating' => true,
 406          )
 407      );
 408  
 409      register_post_status(
 410          'inherit',
 411          array(
 412              'label'               => 'inherit',
 413              'internal'            => true,
 414              '_builtin'            => true, /* internal use only. */
 415              'exclude_from_search' => false,
 416          )
 417      );
 418  
 419      register_post_status(
 420          'request-pending',
 421          array(
 422              'label'               => _x( 'Pending', 'request status' ),
 423              'internal'            => true,
 424              '_builtin'            => true, /* internal use only. */
 425              /* translators: %s: Number of pending requests. */
 426              'label_count'         => _n_noop(
 427                  'Pending <span class="count">(%s)</span>',
 428                  'Pending <span class="count">(%s)</span>'
 429              ),
 430              'exclude_from_search' => false,
 431          )
 432      );
 433  
 434      register_post_status(
 435          'request-confirmed',
 436          array(
 437              'label'               => _x( 'Confirmed', 'request status' ),
 438              'internal'            => true,
 439              '_builtin'            => true, /* internal use only. */
 440              /* translators: %s: Number of confirmed requests. */
 441              'label_count'         => _n_noop(
 442                  'Confirmed <span class="count">(%s)</span>',
 443                  'Confirmed <span class="count">(%s)</span>'
 444              ),
 445              'exclude_from_search' => false,
 446          )
 447      );
 448  
 449      register_post_status(
 450          'request-failed',
 451          array(
 452              'label'               => _x( 'Failed', 'request status' ),
 453              'internal'            => true,
 454              '_builtin'            => true, /* internal use only. */
 455              /* translators: %s: Number of failed requests. */
 456              'label_count'         => _n_noop(
 457                  'Failed <span class="count">(%s)</span>',
 458                  'Failed <span class="count">(%s)</span>'
 459              ),
 460              'exclude_from_search' => false,
 461          )
 462      );
 463  
 464      register_post_status(
 465          'request-completed',
 466          array(
 467              'label'               => _x( 'Completed', 'request status' ),
 468              'internal'            => true,
 469              '_builtin'            => true, /* internal use only. */
 470              /* translators: %s: Number of completed requests. */
 471              'label_count'         => _n_noop(
 472                  'Completed <span class="count">(%s)</span>',
 473                  'Completed <span class="count">(%s)</span>'
 474              ),
 475              'exclude_from_search' => false,
 476          )
 477      );
 478  }
 479  
 480  /**
 481   * Retrieve attached file path based on attachment ID.
 482   *
 483   * By default the path will go through the 'get_attached_file' filter, but
 484   * passing a true to the $unfiltered argument of get_attached_file() will
 485   * return the file path unfiltered.
 486   *
 487   * The function works by getting the single post meta name, named
 488   * '_wp_attached_file' and returning it. This is a convenience function to
 489   * prevent looking up the meta name and provide a mechanism for sending the
 490   * attached filename through a filter.
 491   *
 492   * @since 2.0.0
 493   *
 494   * @param int  $attachment_id Attachment ID.
 495   * @param bool $unfiltered    Optional. Whether to apply filters. Default false.
 496   * @return string|false The file path to where the attached file should be, false otherwise.
 497   */
 498  function get_attached_file( $attachment_id, $unfiltered = false ) {
 499      $file = get_post_meta( $attachment_id, '_wp_attached_file', true );
 500  
 501      // If the file is relative, prepend upload dir.
 502      if ( $file && 0 !== strpos( $file, '/' ) && ! preg_match( '|^.:\\\|', $file ) ) {
 503          $uploads = wp_get_upload_dir();
 504          if ( false === $uploads['error'] ) {
 505              $file = $uploads['basedir'] . "/$file";
 506          }
 507      }
 508  
 509      if ( $unfiltered ) {
 510          return $file;
 511      }
 512  
 513      /**
 514       * Filters the attached file based on the given ID.
 515       *
 516       * @since 2.1.0
 517       *
 518       * @param string|false $file          The file path to where the attached file should be, false otherwise.
 519       * @param int          $attachment_id Attachment ID.
 520       */
 521      return apply_filters( 'get_attached_file', $file, $attachment_id );
 522  }
 523  
 524  /**
 525   * Update attachment file path based on attachment ID.
 526   *
 527   * Used to update the file path of the attachment, which uses post meta name
 528   * '_wp_attached_file' to store the path of the attachment.
 529   *
 530   * @since 2.1.0
 531   *
 532   * @param int    $attachment_id Attachment ID.
 533   * @param string $file          File path for the attachment.
 534   * @return bool True on success, false on failure.
 535   */
 536  function update_attached_file( $attachment_id, $file ) {
 537      if ( ! get_post( $attachment_id ) ) {
 538          return false;
 539      }
 540  
 541      /**
 542       * Filters the path to the attached file to update.
 543       *
 544       * @since 2.1.0
 545       *
 546       * @param string $file          Path to the attached file to update.
 547       * @param int    $attachment_id Attachment ID.
 548       */
 549      $file = apply_filters( 'update_attached_file', $file, $attachment_id );
 550  
 551      $file = _wp_relative_upload_path( $file );
 552      if ( $file ) {
 553          return update_post_meta( $attachment_id, '_wp_attached_file', $file );
 554      } else {
 555          return delete_post_meta( $attachment_id, '_wp_attached_file' );
 556      }
 557  }
 558  
 559  /**
 560   * Return relative path to an uploaded file.
 561   *
 562   * The path is relative to the current upload dir.
 563   *
 564   * @since 2.9.0
 565   * @access private
 566   *
 567   * @param string $path Full path to the file.
 568   * @return string Relative path on success, unchanged path on failure.
 569   */
 570  function _wp_relative_upload_path( $path ) {
 571      $new_path = $path;
 572  
 573      $uploads = wp_get_upload_dir();
 574      if ( 0 === strpos( $new_path, $uploads['basedir'] ) ) {
 575              $new_path = str_replace( $uploads['basedir'], '', $new_path );
 576              $new_path = ltrim( $new_path, '/' );
 577      }
 578  
 579      /**
 580       * Filters the relative path to an uploaded file.
 581       *
 582       * @since 2.9.0
 583       *
 584       * @param string $new_path Relative path to the file.
 585       * @param string $path     Full path to the file.
 586       */
 587      return apply_filters( '_wp_relative_upload_path', $new_path, $path );
 588  }
 589  
 590  /**
 591   * Retrieve all children of the post parent ID.
 592   *
 593   * Normally, without any enhancements, the children would apply to pages. In the
 594   * context of the inner workings of WordPress, pages, posts, and attachments
 595   * share the same table, so therefore the functionality could apply to any one
 596   * of them. It is then noted that while this function does not work on posts, it
 597   * does not mean that it won't work on posts. It is recommended that you know
 598   * what context you wish to retrieve the children of.
 599   *
 600   * Attachments may also be made the child of a post, so if that is an accurate
 601   * statement (which needs to be verified), it would then be possible to get
 602   * all of the attachments for a post. Attachments have since changed since
 603   * version 2.5, so this is most likely inaccurate, but serves generally as an
 604   * example of what is possible.
 605   *
 606   * The arguments listed as defaults are for this function and also of the
 607   * get_posts() function. The arguments are combined with the get_children defaults
 608   * and are then passed to the get_posts() function, which accepts additional arguments.
 609   * You can replace the defaults in this function, listed below and the additional
 610   * arguments listed in the get_posts() function.
 611   *
 612   * The 'post_parent' is the most important argument and important attention
 613   * needs to be paid to the $args parameter. If you pass either an object or an
 614   * integer (number), then just the 'post_parent' is grabbed and everything else
 615   * is lost. If you don't specify any arguments, then it is assumed that you are
 616   * in The Loop and the post parent will be grabbed for from the current post.
 617   *
 618   * The 'post_parent' argument is the ID to get the children. The 'numberposts'
 619   * is the amount of posts to retrieve that has a default of '-1', which is
 620   * used to get all of the posts. Giving a number higher than 0 will only
 621   * retrieve that amount of posts.
 622   *
 623   * The 'post_type' and 'post_status' arguments can be used to choose what
 624   * criteria of posts to retrieve. The 'post_type' can be anything, but WordPress
 625   * post types are 'post', 'pages', and 'attachments'. The 'post_status'
 626   * argument will accept any post status within the write administration panels.
 627   *
 628   * @since 2.0.0
 629   *
 630   * @see get_posts()
 631   * @todo Check validity of description.
 632   *
 633   * @global WP_Post $post Global post object.
 634   *
 635   * @param mixed  $args   Optional. User defined arguments for replacing the defaults. Default empty.
 636   * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
 637   *                       correspond to a WP_Post object, an associative array, or a numeric array,
 638   *                       respectively. Default OBJECT.
 639   * @return WP_Post[]|int[] Array of post objects or post IDs.
 640   */
 641  function get_children( $args = '', $output = OBJECT ) {
 642      $kids = array();
 643      if ( empty( $args ) ) {
 644          if ( isset( $GLOBALS['post'] ) ) {
 645              $args = array( 'post_parent' => (int) $GLOBALS['post']->post_parent );
 646          } else {
 647              return $kids;
 648          }
 649      } elseif ( is_object( $args ) ) {
 650          $args = array( 'post_parent' => (int) $args->post_parent );
 651      } elseif ( is_numeric( $args ) ) {
 652          $args = array( 'post_parent' => (int) $args );
 653      }
 654  
 655      $defaults = array(
 656          'numberposts' => -1,
 657          'post_type'   => 'any',
 658          'post_status' => 'any',
 659          'post_parent' => 0,
 660      );
 661  
 662      $parsed_args = wp_parse_args( $args, $defaults );
 663  
 664      $children = get_posts( $parsed_args );
 665  
 666      if ( ! $children ) {
 667          return $kids;
 668      }
 669  
 670      if ( ! empty( $parsed_args['fields'] ) ) {
 671          return $children;
 672      }
 673  
 674      update_post_cache( $children );
 675  
 676      foreach ( $children as $key => $child ) {
 677          $kids[ $child->ID ] = $children[ $key ];
 678      }
 679  
 680      if ( OBJECT == $output ) {
 681          return $kids;
 682      } elseif ( ARRAY_A == $output ) {
 683          $weeuns = array();
 684          foreach ( (array) $kids as $kid ) {
 685              $weeuns[ $kid->ID ] = get_object_vars( $kids[ $kid->ID ] );
 686          }
 687          return $weeuns;
 688      } elseif ( ARRAY_N == $output ) {
 689          $babes = array();
 690          foreach ( (array) $kids as $kid ) {
 691              $babes[ $kid->ID ] = array_values( get_object_vars( $kids[ $kid->ID ] ) );
 692          }
 693          return $babes;
 694      } else {
 695          return $kids;
 696      }
 697  }
 698  
 699  /**
 700   * Get extended entry info (<!--more-->).
 701   *
 702   * There should not be any space after the second dash and before the word
 703   * 'more'. There can be text or space(s) after the word 'more', but won't be
 704   * referenced.
 705   *
 706   * The returned array has 'main', 'extended', and 'more_text' keys. Main has the text before
 707   * the `<!--more-->`. The 'extended' key has the content after the
 708   * `<!--more-->` comment. The 'more_text' key has the custom "Read More" text.
 709   *
 710   * @since 1.0.0
 711   *
 712   * @param string $post Post content.
 713   * @return string[] {
 714   *     Extended entry info.
 715   *
 716   *     @type string $main      Content before the more tag.
 717   *     @type string $extended  Content after the more tag.
 718   *     @type string $more_text Custom read more text, or empty string.
 719   * }
 720   */
 721  function get_extended( $post ) {
 722      // Match the new style more links.
 723      if ( preg_match( '/<!--more(.*?)?-->/', $post, $matches ) ) {
 724          list($main, $extended) = explode( $matches[0], $post, 2 );
 725          $more_text             = $matches[1];
 726      } else {
 727          $main      = $post;
 728          $extended  = '';
 729          $more_text = '';
 730      }
 731  
 732      // Leading and trailing whitespace.
 733      $main      = preg_replace( '/^[\s]*(.*)[\s]*$/', '\\1', $main );
 734      $extended  = preg_replace( '/^[\s]*(.*)[\s]*$/', '\\1', $extended );
 735      $more_text = preg_replace( '/^[\s]*(.*)[\s]*$/', '\\1', $more_text );
 736  
 737      return array(
 738          'main'      => $main,
 739          'extended'  => $extended,
 740          'more_text' => $more_text,
 741      );
 742  }
 743  
 744  /**
 745   * Retrieves post data given a post ID or post object.
 746   *
 747   * See sanitize_post() for optional $filter values. Also, the parameter
 748   * `$post`, must be given as a variable, since it is passed by reference.
 749   *
 750   * @since 1.5.1
 751   *
 752   * @global WP_Post $post Global post object.
 753   *
 754   * @param int|WP_Post|null $post   Optional. Post ID or post object. Defaults to global $post.
 755   * @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
 756   *                                 correspond to a WP_Post object, an associative array, or a numeric array,
 757   *                                 respectively. Default OBJECT.
 758   * @param string           $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
 759   *                                 or 'display'. Default 'raw'.
 760   * @return WP_Post|array|null Type corresponding to $output on success or null on failure.
 761   *                            When $output is OBJECT, a `WP_Post` instance is returned.
 762   */
 763  function get_post( $post = null, $output = OBJECT, $filter = 'raw' ) {
 764      if ( empty( $post ) && isset( $GLOBALS['post'] ) ) {
 765          $post = $GLOBALS['post'];
 766      }
 767  
 768      if ( $post instanceof WP_Post ) {
 769          $_post = $post;
 770      } elseif ( is_object( $post ) ) {
 771          if ( empty( $post->filter ) ) {
 772              $_post = sanitize_post( $post, 'raw' );
 773              $_post = new WP_Post( $_post );
 774          } elseif ( 'raw' === $post->filter ) {
 775              $_post = new WP_Post( $post );
 776          } else {
 777              $_post = WP_Post::get_instance( $post->ID );
 778          }
 779      } else {
 780          $_post = WP_Post::get_instance( $post );
 781      }
 782  
 783      if ( ! $_post ) {
 784          return null;
 785      }
 786  
 787      $_post = $_post->filter( $filter );
 788  
 789      if ( ARRAY_A == $output ) {
 790          return $_post->to_array();
 791      } elseif ( ARRAY_N == $output ) {
 792          return array_values( $_post->to_array() );
 793      }
 794  
 795      return $_post;
 796  }
 797  
 798  /**
 799   * Retrieves the IDs of the ancestors of a post.
 800   *
 801   * @since 2.5.0
 802   *
 803   * @param int|WP_Post $post Post ID or post object.
 804   * @return int[] Array of ancestor IDs or empty array if there are none.
 805   */
 806  function get_post_ancestors( $post ) {
 807      $post = get_post( $post );
 808  
 809      if ( ! $post || empty( $post->post_parent ) || $post->post_parent == $post->ID ) {
 810          return array();
 811      }
 812  
 813      $ancestors = array();
 814  
 815      $id          = $post->post_parent;
 816      $ancestors[] = $id;
 817  
 818      while ( $ancestor = get_post( $id ) ) {
 819          // Loop detection: If the ancestor has been seen before, break.
 820          if ( empty( $ancestor->post_parent ) || ( $ancestor->post_parent == $post->ID ) || in_array( $ancestor->post_parent, $ancestors, true ) ) {
 821              break;
 822          }
 823  
 824          $id          = $ancestor->post_parent;
 825          $ancestors[] = $id;
 826      }
 827  
 828      return $ancestors;
 829  }
 830  
 831  /**
 832   * Retrieve data from a post field based on Post ID.
 833   *
 834   * Examples of the post field will be, 'post_type', 'post_status', 'post_content',
 835   * etc and based off of the post object property or key names.
 836   *
 837   * The context values are based off of the taxonomy filter functions and
 838   * supported values are found within those functions.
 839   *
 840   * @since 2.3.0
 841   * @since 4.5.0 The `$post` parameter was made optional.
 842   *
 843   * @see sanitize_post_field()
 844   *
 845   * @param string      $field   Post field name.
 846   * @param int|WP_Post $post    Optional. Post ID or post object. Defaults to global $post.
 847   * @param string      $context Optional. How to filter the field. Accepts 'raw', 'edit', 'db',
 848   *                             or 'display'. Default 'display'.
 849   * @return string The value of the post field on success, empty string on failure.
 850   */
 851  function get_post_field( $field, $post = null, $context = 'display' ) {
 852      $post = get_post( $post );
 853  
 854      if ( ! $post ) {
 855          return '';
 856      }
 857  
 858      if ( ! isset( $post->$field ) ) {
 859          return '';
 860      }
 861  
 862      return sanitize_post_field( $field, $post->$field, $post->ID, $context );
 863  }
 864  
 865  /**
 866   * Retrieve the mime type of an attachment based on the ID.
 867   *
 868   * This function can be used with any post type, but it makes more sense with
 869   * attachments.
 870   *
 871   * @since 2.0.0
 872   *
 873   * @param int|WP_Post $post Optional. Post ID or post object. Defaults to global $post.
 874   * @return string|false The mime type on success, false on failure.
 875   */
 876  function get_post_mime_type( $post = null ) {
 877      $post = get_post( $post );
 878  
 879      if ( is_object( $post ) ) {
 880          return $post->post_mime_type;
 881      }
 882  
 883      return false;
 884  }
 885  
 886  /**
 887   * Retrieve the post status based on the post ID.
 888   *
 889   * If the post ID is of an attachment, then the parent post status will be given
 890   * instead.
 891   *
 892   * @since 2.0.0
 893   *
 894   * @param int|WP_Post $post Optional. Post ID or post object. Defaults to global $post..
 895   * @return string|false Post status on success, false on failure.
 896   */
 897  function get_post_status( $post = null ) {
 898      $post = get_post( $post );
 899  
 900      if ( ! is_object( $post ) ) {
 901          return false;
 902      }
 903  
 904      if ( 'attachment' === $post->post_type ) {
 905          if ( 'private' === $post->post_status ) {
 906              return 'private';
 907          }
 908  
 909          // Unattached attachments are assumed to be published.
 910          if ( ( 'inherit' === $post->post_status ) && ( 0 == $post->post_parent ) ) {
 911              return 'publish';
 912          }
 913  
 914          // Inherit status from the parent.
 915          if ( $post->post_parent && ( $post->ID != $post->post_parent ) ) {
 916              $parent_post_status = get_post_status( $post->post_parent );
 917              if ( 'trash' === $parent_post_status ) {
 918                  return get_post_meta( $post->post_parent, '_wp_trash_meta_status', true );
 919              } else {
 920                  return $parent_post_status;
 921              }
 922          }
 923      }
 924  
 925      /**
 926       * Filters the post status.
 927       *
 928       * @since 4.4.0
 929       *
 930       * @param string  $post_status The post status.
 931       * @param WP_Post $post        The post object.
 932       */
 933      return apply_filters( 'get_post_status', $post->post_status, $post );
 934  }
 935  
 936  /**
 937   * Retrieve all of the WordPress supported post statuses.
 938   *
 939   * Posts have a limited set of valid status values, this provides the
 940   * post_status values and descriptions.
 941   *
 942   * @since 2.5.0
 943   *
 944   * @return string[] Array of post status labels keyed by their status.
 945   */
 946  function get_post_statuses() {
 947      $status = array(
 948          'draft'   => __( 'Draft' ),
 949          'pending' => __( 'Pending Review' ),
 950          'private' => __( 'Private' ),
 951          'publish' => __( 'Published' ),
 952      );
 953  
 954      return $status;
 955  }
 956  
 957  /**
 958   * Retrieve all of the WordPress support page statuses.
 959   *
 960   * Pages have a limited set of valid status values, this provides the
 961   * post_status values and descriptions.
 962   *
 963   * @since 2.5.0
 964   *
 965   * @return string[] Array of page status labels keyed by their status.
 966   */
 967  function get_page_statuses() {
 968      $status = array(
 969          'draft'   => __( 'Draft' ),
 970          'private' => __( 'Private' ),
 971          'publish' => __( 'Published' ),
 972      );
 973  
 974      return $status;
 975  }
 976  
 977  /**
 978   * Return statuses for privacy requests.
 979   *
 980   * @since 4.9.6
 981   * @access private
 982   *
 983   * @return array
 984   */
 985  function _wp_privacy_statuses() {
 986      return array(
 987          'request-pending'   => _x( 'Pending', 'request status' ),      // Pending confirmation from user.
 988          'request-confirmed' => _x( 'Confirmed', 'request status' ),    // User has confirmed the action.
 989          'request-failed'    => _x( 'Failed', 'request status' ),       // User failed to confirm the action.
 990          'request-completed' => _x( 'Completed', 'request status' ),    // Admin has handled the request.
 991      );
 992  }
 993  
 994  /**
 995   * Register a post status. Do not use before init.
 996   *
 997   * A simple function for creating or modifying a post status based on the
 998   * parameters given. The function will accept an array (second optional
 999   * parameter), along with a string for the post status name.
1000   *
1001   * Arguments prefixed with an _underscore shouldn't be used by plugins and themes.
1002   *
1003   * @since 3.0.0
1004   *
1005   * @global array $wp_post_statuses Inserts new post status object into the list
1006   *
1007   * @param string       $post_status Name of the post status.
1008   * @param array|string $args {
1009   *     Optional. Array or string of post status arguments.
1010   *
1011   *     @type bool|string $label                     A descriptive name for the post status marked
1012   *                                                  for translation. Defaults to value of $post_status.
1013   *     @type bool|array  $label_count               Descriptive text to use for nooped plurals.
1014   *                                                  Default array of $label, twice.
1015   *     @type bool        $exclude_from_search       Whether to exclude posts with this post status
1016   *                                                  from search results. Default is value of $internal.
1017   *     @type bool        $_builtin                  Whether the status is built-in. Core-use only.
1018   *                                                  Default false.
1019   *     @type bool        $public                    Whether posts of this status should be shown
1020   *                                                  in the front end of the site. Default false.
1021   *     @type bool        $internal                  Whether the status is for internal use only.
1022   *                                                  Default false.
1023   *     @type bool        $protected                 Whether posts with this status should be protected.
1024   *                                                  Default false.
1025   *     @type bool        $private                   Whether posts with this status should be private.
1026   *                                                  Default false.
1027   *     @type bool        $publicly_queryable        Whether posts with this status should be publicly-
1028   *                                                  queryable. Default is value of $public.
1029   *     @type bool        $show_in_admin_all_list    Whether to include posts in the edit listing for
1030   *                                                  their post type. Default is the opposite value
1031   *                                                  of $internal.
1032   *     @type bool        $show_in_admin_status_list Show in the list of statuses with post counts at
1033   *                                                  the top of the edit listings,
1034   *                                                  e.g. All (12) | Published (9) | My Custom Status (2)
1035   *                                                  Default is the opposite value of $internal.
1036   *     @type bool        $date_floating             Whether the post has a floating creation date.
1037   *                                                  Default to false.
1038   * }
1039   * @return object
1040   */
1041  function register_post_status( $post_status, $args = array() ) {
1042      global $wp_post_statuses;
1043  
1044      if ( ! is_array( $wp_post_statuses ) ) {
1045          $wp_post_statuses = array();
1046      }
1047  
1048      // Args prefixed with an underscore are reserved for internal use.
1049      $defaults = array(
1050          'label'                     => false,
1051          'label_count'               => false,
1052          'exclude_from_search'       => null,
1053          '_builtin'                  => false,
1054          'public'                    => null,
1055          'internal'                  => null,
1056          'protected'                 => null,
1057          'private'                   => null,
1058          'publicly_queryable'        => null,
1059          'show_in_admin_status_list' => null,
1060          'show_in_admin_all_list'    => null,
1061          'date_floating'             => null,
1062      );
1063      $args     = wp_parse_args( $args, $defaults );
1064      $args     = (object) $args;
1065  
1066      $post_status = sanitize_key( $post_status );
1067      $args->name  = $post_status;
1068  
1069      // Set various defaults.
1070      if ( null === $args->public && null === $args->internal && null === $args->protected && null === $args->private ) {
1071          $args->internal = true;
1072      }
1073  
1074      if ( null === $args->public ) {
1075          $args->public = false;
1076      }
1077  
1078      if ( null === $args->private ) {
1079          $args->private = false;
1080      }
1081  
1082      if ( null === $args->protected ) {
1083          $args->protected = false;
1084      }
1085  
1086      if ( null === $args->internal ) {
1087          $args->internal = false;
1088      }
1089  
1090      if ( null === $args->publicly_queryable ) {
1091          $args->publicly_queryable = $args->public;
1092      }
1093  
1094      if ( null === $args->exclude_from_search ) {
1095          $args->exclude_from_search = $args->internal;
1096      }
1097  
1098      if ( null === $args->show_in_admin_all_list ) {
1099          $args->show_in_admin_all_list = ! $args->internal;
1100      }
1101  
1102      if ( null === $args->show_in_admin_status_list ) {
1103          $args->show_in_admin_status_list = ! $args->internal;
1104      }
1105  
1106      if ( null === $args->date_floating ) {
1107          $args->date_floating = false;
1108      }
1109  
1110      if ( false === $args->label ) {
1111          $args->label = $post_status;
1112      }
1113  
1114      if ( false === $args->label_count ) {
1115          // phpcs:ignore WordPress.WP.I18n.NonSingularStringLiteralSingle,WordPress.WP.I18n.NonSingularStringLiteralPlural
1116          $args->label_count = _n_noop( $args->label, $args->label );
1117      }
1118  
1119      $wp_post_statuses[ $post_status ] = $args;
1120  
1121      return $args;
1122  }
1123  
1124  /**
1125   * Retrieve a post status object by name.
1126   *
1127   * @since 3.0.0
1128   *
1129   * @global array $wp_post_statuses List of post statuses.
1130   *
1131   * @see register_post_status()
1132   *
1133   * @param string $post_status The name of a registered post status.
1134   * @return object|null A post status object.
1135   */
1136  function get_post_status_object( $post_status ) {
1137      global $wp_post_statuses;
1138  
1139      if ( empty( $wp_post_statuses[ $post_status ] ) ) {
1140          return null;
1141      }
1142  
1143      return $wp_post_statuses[ $post_status ];
1144  }
1145  
1146  /**
1147   * Get a list of post statuses.
1148   *
1149   * @since 3.0.0
1150   *
1151   * @global array $wp_post_statuses List of post statuses.
1152   *
1153   * @see register_post_status()
1154   *
1155   * @param array|string $args     Optional. Array or string of post status arguments to compare against
1156   *                               properties of the global `$wp_post_statuses objects`. Default empty array.
1157   * @param string       $output   Optional. The type of output to return, either 'names' or 'objects'. Default 'names'.
1158   * @param string       $operator Optional. The logical operation to perform. 'or' means only one element
1159   *                               from the array needs to match; 'and' means all elements must match.
1160   *                               Default 'and'.
1161   * @return array A list of post status names or objects.
1162   */
1163  function get_post_stati( $args = array(), $output = 'names', $operator = 'and' ) {
1164      global $wp_post_statuses;
1165  
1166      $field = ( 'names' === $output ) ? 'name' : false;
1167  
1168      return wp_filter_object_list( $wp_post_statuses, $args, $operator, $field );
1169  }
1170  
1171  /**
1172   * Whether the post type is hierarchical.
1173   *
1174   * A false return value might also mean that the post type does not exist.
1175   *
1176   * @since 3.0.0
1177   *
1178   * @see get_post_type_object()
1179   *
1180   * @param string $post_type Post type name
1181   * @return bool Whether post type is hierarchical.
1182   */
1183  function is_post_type_hierarchical( $post_type ) {
1184      if ( ! post_type_exists( $post_type ) ) {
1185          return false;
1186      }
1187  
1188      $post_type = get_post_type_object( $post_type );
1189      return $post_type->hierarchical;
1190  }
1191  
1192  /**
1193   * Determines whether a post type is registered.
1194   *
1195   * For more information on this and similar theme functions, check out
1196   * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
1197   * Conditional Tags} article in the Theme Developer Handbook.
1198   *
1199   * @since 3.0.0
1200   *
1201   * @see get_post_type_object()
1202   *
1203   * @param string $post_type Post type name.
1204   * @return bool Whether post type is registered.
1205   */
1206  function post_type_exists( $post_type ) {
1207      return (bool) get_post_type_object( $post_type );
1208  }
1209  
1210  /**
1211   * Retrieves the post type of the current post or of a given post.
1212   *
1213   * @since 2.1.0
1214   *
1215   * @param int|WP_Post|null $post Optional. Post ID or post object. Default is global $post.
1216   * @return string|false          Post type on success, false on failure.
1217   */
1218  function get_post_type( $post = null ) {
1219      $post = get_post( $post );
1220      if ( $post ) {
1221          return $post->post_type;
1222      }
1223  
1224      return false;
1225  }
1226  
1227  /**
1228   * Retrieves a post type object by name.
1229   *
1230   * @since 3.0.0
1231   * @since 4.6.0 Object returned is now an instance of `WP_Post_Type`.
1232   *
1233   * @global array $wp_post_types List of post types.
1234   *
1235   * @see register_post_type()
1236   *
1237   * @param string $post_type The name of a registered post type.
1238   * @return WP_Post_Type|null WP_Post_Type object if it exists, null otherwise.
1239   */
1240  function get_post_type_object( $post_type ) {
1241      global $wp_post_types;
1242  
1243      if ( ! is_scalar( $post_type ) || empty( $wp_post_types[ $post_type ] ) ) {
1244          return null;
1245      }
1246  
1247      return $wp_post_types[ $post_type ];
1248  }
1249  
1250  /**
1251   * Get a list of all registered post type objects.
1252   *
1253   * @since 2.9.0
1254   *
1255   * @global array $wp_post_types List of post types.
1256   *
1257   * @see register_post_type() for accepted arguments.
1258   *
1259   * @param array|string $args     Optional. An array of key => value arguments to match against
1260   *                               the post type objects. Default empty array.
1261   * @param string       $output   Optional. The type of output to return. Accepts post type 'names'
1262   *                               or 'objects'. Default 'names'.
1263   * @param string       $operator Optional. The logical operation to perform. 'or' means only one
1264   *                               element from the array needs to match; 'and' means all elements
1265   *                               must match; 'not' means no elements may match. Default 'and'.
1266   * @return string[]|WP_Post_Type[] An array of post type names or objects.
1267   */
1268  function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
1269      global $wp_post_types;
1270  
1271      $field = ( 'names' === $output ) ? 'name' : false;
1272  
1273      return wp_filter_object_list( $wp_post_types, $args, $operator, $field );
1274  }
1275  
1276  /**
1277   * Registers a post type.
1278   *
1279   * Note: Post type registrations should not be hooked before the
1280   * {@see 'init'} action. Also, any taxonomy connections should be
1281   * registered via the `$taxonomies` argument to ensure consistency
1282   * when hooks such as {@see 'parse_query'} or {@see 'pre_get_posts'}
1283   * are used.
1284   *
1285   * Post types can support any number of built-in core features such
1286   * as meta boxes, custom fields, post thumbnails, post statuses,
1287   * comments, and more. See the `$supports` argument for a complete
1288   * list of supported features.
1289   *
1290   * @since 2.9.0
1291   * @since 3.0.0 The `show_ui` argument is now enforced on the new post screen.
1292   * @since 4.4.0 The `show_ui` argument is now enforced on the post type listing
1293   *              screen and post editing screen.
1294   * @since 4.6.0 Post type object returned is now an instance of `WP_Post_Type`.
1295   * @since 4.7.0 Introduced `show_in_rest`, `rest_base` and `rest_controller_class`
1296   *              arguments to register the post type in REST API.
1297   * @since 5.3.0 The `supports` argument will now accept an array of arguments for a feature.
1298   * .
1299   * @global array $wp_post_types List of post types.
1300   *
1301   * @param string       $post_type Post type key. Must not exceed 20 characters and may
1302   *                                only contain lowercase alphanumeric characters, dashes,
1303   *                                and underscores. See sanitize_key().
1304   * @param array|string $args {
1305   *     Array or string of arguments for registering a post type.
1306   *
1307   *     @type string      $label                 Name of the post type shown in the menu. Usually plural.
1308   *                                              Default is value of $labels['name'].
1309   *     @type array       $labels                An array of labels for this post type. If not set, post
1310   *                                              labels are inherited for non-hierarchical types and page
1311   *                                              labels for hierarchical ones. See get_post_type_labels() for a full
1312   *                                              list of supported labels.
1313   *     @type string      $description           A short descriptive summary of what the post type is.
1314   *                                              Default empty.
1315   *     @type bool        $public                Whether a post type is intended for use publicly either via
1316   *                                              the admin interface or by front-end users. While the default
1317   *                                              settings of $exclude_from_search, $publicly_queryable, $show_ui,
1318   *                                              and $show_in_nav_menus are inherited from public, each does not
1319   *                                              rely on this relationship and controls a very specific intention.
1320   *                                              Default false.
1321   *     @type bool        $hierarchical          Whether the post type is hierarchical (e.g. page). Default false.
1322   *     @type bool        $exclude_from_search   Whether to exclude posts with this post type from front end search
1323   *                                              results. Default is the opposite value of $public.
1324   *     @type bool        $publicly_queryable    Whether queries can be performed on the front end for the post type
1325   *                                              as part of parse_request(). Endpoints would include:
1326   *                                              * ?post_type={post_type_key}
1327   *                                              * ?{post_type_key}={single_post_slug}
1328   *                                              * ?{post_type_query_var}={single_post_slug}
1329   *                                              If not set, the default is inherited from $public.
1330   *     @type bool        $show_ui               Whether to generate and allow a UI for managing this post type in the
1331   *                                              admin. Default is value of $public.
1332   *     @type bool|string $show_in_menu          Where to show the post type in the admin menu. To work, $show_ui
1333   *                                              must be true. If true, the post type is shown in its own top level
1334   *                                              menu. If false, no menu is shown. If a string of an existing top
1335   *                                              level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
1336   *                                              type will be placed as a sub-menu of that.
1337   *                                              Default is value of $show_ui.
1338   *     @type bool        $show_in_nav_menus     Makes this post type available for selection in navigation menus.
1339   *                                              Default is value of $public.
1340   *     @type bool        $show_in_admin_bar     Makes this post type available via the admin bar. Default is value
1341   *                                              of $show_in_menu.
1342   *     @type bool        $show_in_rest          Whether to include the post type in the REST API. Set this to true
1343   *                                              for the post type to be available in the block editor.
1344   *     @type string      $rest_base             To change the base url of REST API route. Default is $post_type.
1345   *     @type string      $rest_controller_class REST API Controller class name. Default is 'WP_REST_Posts_Controller'.
1346   *     @type int         $menu_position         The position in the menu order the post type should appear. To work,
1347   *                                              $show_in_menu must be true. Default null (at the bottom).
1348   *     @type string      $menu_icon             The url to the icon to be used for this menu. Pass a base64-encoded
1349   *                                              SVG using a data URI, which will be colored to match the color scheme
1350   *                                              -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
1351   *                                              of a Dashicons helper class to use a font icon, e.g.
1352   *                                              'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
1353   *                                              so an icon can be added via CSS. Defaults to use the posts icon.
1354   *     @type string      $capability_type       The string to use to build the read, edit, and delete capabilities.
1355   *                                              May be passed as an array to allow for alternative plurals when using
1356   *                                              this argument as a base to construct the capabilities, e.g.
1357   *                                              array('story', 'stories'). Default 'post'.
1358   *     @type array       $capabilities          Array of capabilities for this post type. $capability_type is used
1359   *                                              as a base to construct capabilities by default.
1360   *                                              See get_post_type_capabilities().
1361   *     @type bool        $map_meta_cap          Whether to use the internal default meta capability handling.
1362   *                                              Default false.
1363   *     @type array       $supports              Core feature(s) the post type supports. Serves as an alias for calling
1364   *                                              add_post_type_support() directly. Core features include 'title',
1365   *                                              'editor', 'comments', 'revisions', 'trackbacks', 'author', 'excerpt',
1366   *                                              'page-attributes', 'thumbnail', 'custom-fields', and 'post-formats'.
1367   *                                              Additionally, the 'revisions' feature dictates whether the post type
1368   *                                              will store revisions, and the 'comments' feature dictates whether the
1369   *                                              comments count will show on the edit screen. A feature can also be
1370   *                                              specified as an array of arguments to provide additional information
1371   *                                              about supporting that feature.
1372   *                                              Example: `array( 'my_feature', array( 'field' => 'value' ) )`.
1373   *                                              Default is an array containing 'title' and 'editor'.
1374   *     @type callable    $register_meta_box_cb  Provide a callback function that sets up the meta boxes for the
1375   *                                              edit form. Do remove_meta_box() and add_meta_box() calls in the
1376   *                                              callback. Default null.
1377   *     @type array       $taxonomies            An array of taxonomy identifiers that will be registered for the
1378   *                                              post type. Taxonomies can be registered later with register_taxonomy()
1379   *                                              or register_taxonomy_for_object_type().
1380   *                                              Default empty array.
1381   *     @type bool|string $has_archive           Whether there should be post type archives, or if a string, the
1382   *                                              archive slug to use. Will generate the proper rewrite rules if
1383   *                                              $rewrite is enabled. Default false.
1384   *     @type bool|array  $rewrite              {
1385   *         Triggers the handling of rewrites for this post type. To prevent rewrite, set to false.
1386   *         Defaults to true, using $post_type as slug. To specify rewrite rules, an array can be
1387   *         passed with any of these keys:
1388   *
1389   *         @type string $slug       Customize the permastruct slug. Defaults to $post_type key.
1390   *         @type bool   $with_front Whether the permastruct should be prepended with WP_Rewrite::$front.
1391   *                                  Default true.
1392   *         @type bool   $feeds      Whether the feed permastruct should be built for this post type.
1393   *                                  Default is value of $has_archive.
1394   *         @type bool   $pages      Whether the permastruct should provide for pagination. Default true.
1395   *         @type const  $ep_mask    Endpoint mask to assign. If not specified and permalink_epmask is set,
1396   *                                  inherits from $permalink_epmask. If not specified and permalink_epmask
1397   *                                  is not set, defaults to EP_PERMALINK.
1398   *     }
1399   *     @type string|bool $query_var             Sets the query_var key for this post type. Defaults to $post_type
1400   *                                              key. If false, a post type cannot be loaded at
1401   *                                              ?{query_var}={post_slug}. If specified as a string, the query
1402   *                                              ?{query_var_string}={post_slug} will be valid.
1403   *     @type bool        $can_export            Whether to allow this post type to be exported. Default true.
1404   *     @type bool        $delete_with_user      Whether to delete posts of this type when deleting a user. If true,
1405   *                                              posts of this type belonging to the user will be moved to Trash
1406   *                                              when then user is deleted. If false, posts of this type belonging
1407   *                                              to the user will *not* be trashed or deleted. If not set (the default),
1408   *                                              posts are trashed if post_type_supports('author'). Otherwise posts
1409   *                                              are not trashed or deleted. Default null.
1410   *     @type bool        $_builtin              FOR INTERNAL USE ONLY! True if this post type is a native or
1411   *                                              "built-in" post_type. Default false.
1412   *     @type string      $_edit_link            FOR INTERNAL USE ONLY! URL segment to use for edit link of
1413   *                                              this post type. Default 'post.php?post=%d'.
1414   * }
1415   * @return WP_Post_Type|WP_Error The registered post type object on success,
1416   *                               WP_Error object on failure.
1417   */
1418  function register_post_type( $post_type, $args = array() ) {
1419      global $wp_post_types;
1420  
1421      if ( ! is_array( $wp_post_types ) ) {
1422          $wp_post_types = array();
1423      }
1424  
1425      // Sanitize post type name.
1426      $post_type = sanitize_key( $post_type );
1427  
1428      if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {
1429          _doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2.0' );
1430          return new WP_Error( 'post_type_length_invalid', __( 'Post type names must be between 1 and 20 characters in length.' ) );
1431      }
1432  
1433      $post_type_object = new WP_Post_Type( $post_type, $args );
1434      $post_type_object->add_supports();
1435      $post_type_object->add_rewrite_rules();
1436      $post_type_object->register_meta_boxes();
1437  
1438      $wp_post_types[ $post_type ] = $post_type_object;
1439  
1440      $post_type_object->add_hooks();
1441      $post_type_object->register_taxonomies();
1442  
1443      /**
1444       * Fires after a post type is registered.
1445       *
1446       * @since 3.3.0
1447       * @since 4.6.0 Converted the `$post_type` parameter to accept a `WP_Post_Type` object.
1448       *
1449       * @param string       $post_type        Post type.
1450       * @param WP_Post_Type $post_type_object Arguments used to register the post type.
1451       */
1452      do_action( 'registered_post_type', $post_type, $post_type_object );
1453  
1454      return $post_type_object;
1455  }
1456  
1457  /**
1458   * Unregisters a post type.
1459   *
1460   * Can not be used to unregister built-in post types.
1461   *
1462   * @since 4.5.0
1463   *
1464   * @global array $wp_post_types List of post types.
1465   *
1466   * @param string $post_type Post type to unregister.
1467   * @return bool|WP_Error True on success, WP_Error on failure or if the post type doesn't exist.
1468   */
1469  function unregister_post_type( $post_type ) {
1470      global $wp_post_types;
1471  
1472      if ( ! post_type_exists( $post_type ) ) {
1473          return new WP_Error( 'invalid_post_type', __( 'Invalid post type.' ) );
1474      }
1475  
1476      $post_type_object = get_post_type_object( $post_type );
1477  
1478      // Do not allow unregistering internal post types.
1479      if ( $post_type_object->_builtin ) {
1480          return new WP_Error( 'invalid_post_type', __( 'Unregistering a built-in post type is not allowed' ) );
1481      }
1482  
1483      $post_type_object->remove_supports();
1484      $post_type_object->remove_rewrite_rules();
1485      $post_type_object->unregister_meta_boxes();
1486      $post_type_object->remove_hooks();
1487      $post_type_object->unregister_taxonomies();
1488  
1489      unset( $wp_post_types[ $post_type ] );
1490  
1491      /**
1492       * Fires after a post type was unregistered.
1493       *
1494       * @since 4.5.0
1495       *
1496       * @param string $post_type Post type key.
1497       */
1498      do_action( 'unregistered_post_type', $post_type );
1499  
1500      return true;
1501  }
1502  
1503  /**
1504   * Build an object with all post type capabilities out of a post type object
1505   *
1506   * Post type capabilities use the 'capability_type' argument as a base, if the
1507   * capability is not set in the 'capabilities' argument array or if the
1508   * 'capabilities' argument is not supplied.
1509   *
1510   * The capability_type argument can optionally be registered as an array, with
1511   * the first value being singular and the second plural, e.g. array('story, 'stories')
1512   * Otherwise, an 's' will be added to the value for the plural form. After
1513   * registration, capability_type will always be a string of the singular value.
1514   *
1515   * By default, eight keys are accepted as part of the capabilities array:
1516   *
1517   * - edit_post, read_post, and delete_post are meta capabilities, which are then
1518   *   generally mapped to corresponding primitive capabilities depending on the
1519   *   context, which would be the post being edited/read/deleted and the user or
1520   *   role being checked. Thus these capabilities would generally not be granted
1521   *   directly to users or roles.
1522   *
1523   * - edit_posts - Controls whether objects of this post type can be edited.
1524   * - edit_others_posts - Controls whether objects of this type owned by other users
1525   *   can be edited. If the post type does not support an author, then this will
1526   *   behave like edit_posts.
1527   * - delete_posts - Controls whether objects of this post type can be deleted.
1528   * - publish_posts - Controls publishing objects of this post type.
1529   * - read_private_posts - Controls whether private objects can be read.
1530   *
1531   * These five primitive capabilities are checked in core in various locations.
1532   * There are also six other primitive capabilities which are not referenced
1533   * directly in core, except in map_meta_cap(), which takes the three aforementioned
1534   * meta capabilities and translates them into one or more primitive capabilities
1535   * that must then be checked against the user or role, depending on the context.
1536   *
1537   * - read - Controls whether objects of this post type can be read.
1538   * - delete_private_posts - Controls whether private objects can be deleted.
1539   * - delete_published_posts - Controls whether published objects can be deleted.
1540   * - delete_others_posts - Controls whether objects owned by other users can be
1541   *   can be deleted. If the post type does not support an author, then this will
1542   *   behave like delete_posts.
1543   * - edit_private_posts - Controls whether private objects can be edited.
1544   * - edit_published_posts - Controls whether published objects can be edited.
1545   *
1546   * These additional capabilities are only used in map_meta_cap(). Thus, they are
1547   * only assigned by default if the post type is registered with the 'map_meta_cap'
1548   * argument set to true (default is false).
1549   *
1550   * @since 3.0.0
1551   * @since 5.4.0 'delete_posts' is included in default capabilities.
1552   *
1553   * @see register_post_type()
1554   * @see map_meta_cap()
1555   *
1556   * @param object $args Post type registration arguments.
1557   * @return object Object with all the capabilities as member variables.
1558   */
1559  function get_post_type_capabilities( $args ) {
1560      if ( ! is_array( $args->capability_type ) ) {
1561          $args->capability_type = array( $args->capability_type, $args->capability_type . 's' );
1562      }
1563  
1564      // Singular base for meta capabilities, plural base for primitive capabilities.
1565      list( $singular_base, $plural_base ) = $args->capability_type;
1566  
1567      $default_capabilities = array(
1568          // Meta capabilities.
1569          'edit_post'          => 'edit_' . $singular_base,
1570          'read_post'          => 'read_' . $singular_base,
1571          'delete_post'        => 'delete_' . $singular_base,
1572          // Primitive capabilities used outside of map_meta_cap():
1573          'edit_posts'         => 'edit_' . $plural_base,
1574          'edit_others_posts'  => 'edit_others_' . $plural_base,
1575          'delete_posts'       => 'delete_' . $plural_base,
1576          'publish_posts'      => 'publish_' . $plural_base,
1577          'read_private_posts' => 'read_private_' . $plural_base,
1578      );
1579  
1580      // Primitive capabilities used within map_meta_cap():
1581      if ( $args->map_meta_cap ) {
1582          $default_capabilities_for_mapping = array(
1583              'read'                   => 'read',
1584              'delete_private_posts'   => 'delete_private_' . $plural_base,
1585              'delete_published_posts' => 'delete_published_' . $plural_base,
1586              'delete_others_posts'    => 'delete_others_' . $plural_base,
1587              'edit_private_posts'     => 'edit_private_' . $plural_base,
1588              'edit_published_posts'   => 'edit_published_' . $plural_base,
1589          );
1590          $default_capabilities             = array_merge( $default_capabilities, $default_capabilities_for_mapping );
1591      }
1592  
1593      $capabilities = array_merge( $default_capabilities, $args->capabilities );
1594  
1595      // Post creation capability simply maps to edit_posts by default:
1596      if ( ! isset( $capabilities['create_posts'] ) ) {
1597          $capabilities['create_posts'] = $capabilities['edit_posts'];
1598      }
1599  
1600      // Remember meta capabilities for future reference.
1601      if ( $args->map_meta_cap ) {
1602          _post_type_meta_capabilities( $capabilities );
1603      }
1604  
1605      return (object) $capabilities;
1606  }
1607  
1608  /**
1609   * Store or return a list of post type meta caps for map_meta_cap().
1610   *
1611   * @since 3.1.0
1612   * @access private
1613   *
1614   * @global array $post_type_meta_caps Used to store meta capabilities.
1615   *
1616   * @param string[] $capabilities Post type meta capabilities.
1617   */
1618  function _post_type_meta_capabilities( $capabilities = null ) {
1619      global $post_type_meta_caps;
1620  
1621      foreach ( $capabilities as $core => $custom ) {
1622          if ( in_array( $core, array( 'read_post', 'delete_post', 'edit_post' ), true ) ) {
1623              $post_type_meta_caps[ $custom ] = $core;
1624          }
1625      }
1626  }
1627  
1628  /**
1629   * Builds an object with all post type labels out of a post type object.
1630   *
1631   * Accepted keys of the label array in the post type object:
1632   *
1633   * - `name` - General name for the post type, usually plural. The same and overridden
1634   *          by `$post_type_object->label`. Default is 'Posts' / 'Pages'.
1635   * - `singular_name` - Name for one object of this post type. Default is 'Post' / 'Page'.
1636   * - `add_new` - Default is 'Add New' for both hierarchical and non-hierarchical types.
1637   *             When internationalizing this string, please use a {@link https://developer.wordpress.org/plugins/internationalization/how-to-internationalize-your-plugin/#disambiguation-by-context gettext context}
1638   *             matching your post type. Example: `_x( 'Add New', 'product', 'textdomain' );`.
1639   * - `add_new_item` - Label for adding a new singular item. Default is 'Add New Post' / 'Add New Page'.
1640   * - `edit_item` - Label for editing a singular item. Default is 'Edit Post' / 'Edit Page'.
1641   * - `new_item` - Label for the new item page title. Default is 'New Post' / 'New Page'.
1642   * - `view_item` - Label for viewing a singular item. Default is 'View Post' / 'View Page'.
1643   * - `view_items` - Label for viewing post type archives. Default is 'View Posts' / 'View Pages'.
1644   * - `search_items` - Label for searching plural items. Default is 'Search Posts' / 'Search Pages'.
1645   * - `not_found` - Label used when no items are found. Default is 'No posts found' / 'No pages found'.
1646   * - `not_found_in_trash` - Label used when no items are in the Trash. Default is 'No posts found in Trash' /
1647   *                        'No pages found in Trash'.
1648   * - `parent_item_colon` - Label used to prefix parents of hierarchical items. Not used on non-hierarchical
1649   *                       post types. Default is 'Parent Page:'.
1650   * - `all_items` - Label to signify all items in a submenu link. Default is 'All Posts' / 'All Pages'.
1651   * - `archives` - Label for archives in nav menus. Default is 'Post Archives' / 'Page Archives'.
1652   * - `attributes` - Label for the attributes meta box. Default is 'Post Attributes' / 'Page Attributes'.
1653   * - `insert_into_item` - Label for the media frame button. Default is 'Insert into post' / 'Insert into page'.
1654   * - `uploaded_to_this_item` - Label for the media frame filter. Default is 'Uploaded to this post' /
1655   *                           'Uploaded to this page'.
1656   * - `featured_image` - Label for the featured image meta box title. Default is 'Featured image'.
1657   * - `set_featured_image` - Label for setting the featured image. Default is 'Set featured image'.
1658   * - `remove_featured_image` - Label for removing the featured image. Default is 'Remove featured image'.
1659   * - `use_featured_image` - Label in the media frame for using a featured image. Default is 'Use as featured image'.
1660   * - `menu_name` - Label for the menu name. Default is the same as `name`.
1661   * - `filter_items_list` - Label for the table views hidden heading. Default is 'Filter posts list' /
1662   *                       'Filter pages list'.
1663   * - `items_list_navigation` - Label for the table pagination hidden heading. Default is 'Posts list navigation' /
1664   *                           'Pages list navigation'.
1665   * - `items_list` - Label for the table hidden heading. Default is 'Posts list' / 'Pages list'.
1666   * - `item_published` - Label used when an item is published. Default is 'Post published.' / 'Page published.'
1667   * - `item_published_privately` - Label used when an item is published with private visibility.
1668   *                              Default is 'Post published privately.' / 'Page published privately.'
1669   * - `item_reverted_to_draft` - Label used when an item is switched to a draft.
1670   *                            Default is 'Post reverted to draft.' / 'Page reverted to draft.'
1671   * - `item_scheduled` - Label used when an item is scheduled for publishing. Default is 'Post scheduled.' /
1672   *                    'Page scheduled.'
1673   * - `item_updated` - Label used when an item is updated. Default is 'Post updated.' / 'Page updated.'
1674   *
1675   * Above, the first default value is for non-hierarchical post types (like posts)
1676   * and the second one is for hierarchical post types (like pages).
1677   *
1678   * Note: To set labels used in post type admin notices, see the {@see 'post_updated_messages'} filter.
1679   *
1680   * @since 3.0.0
1681   * @since 4.3.0 Added the `featured_image`, `set_featured_image`, `remove_featured_image`,
1682   *              and `use_featured_image` labels.
1683   * @since 4.4.0 Added the `archives`, `insert_into_item`, `uploaded_to_this_item`, `filter_items_list`,
1684   *              `items_list_navigation`, and `items_list` labels.
1685   * @since 4.6.0 Converted the `$post_type` parameter to accept a `WP_Post_Type` object.
1686   * @since 4.7.0 Added the `view_items` and `attributes` labels.
1687   * @since 5.0.0 Added the `item_published`, `item_published_privately`, `item_reverted_to_draft`,
1688   *              `item_scheduled`, and `item_updated` labels.
1689   *
1690   * @access private
1691   *
1692   * @param object|WP_Post_Type $post_type_object Post type object.
1693   * @return object Object with all the labels as member variables.
1694   */
1695  function get_post_type_labels( $post_type_object ) {
1696      $nohier_vs_hier_defaults              = array(
1697          'name'                     => array( _x( 'Posts', 'post type general name' ), _x( 'Pages', 'post type general name' ) ),
1698          'singular_name'            => array( _x( 'Post', 'post type singular name' ), _x( 'Page', 'post type singular name' ) ),
1699          'add_new'                  => array( _x( 'Add New', 'post' ), _x( 'Add New', 'page' ) ),
1700          'add_new_item'             => array( __( 'Add New Post' ), __( 'Add New Page' ) ),
1701          'edit_item'                => array( __( 'Edit Post' ), __( 'Edit Page' ) ),
1702          'new_item'                 => array( __( 'New Post' ), __( 'New Page' ) ),
1703          'view_item'                => array( __( 'View Post' ), __( 'View Page' ) ),
1704          'view_items'               => array( __( 'View Posts' ), __( 'View Pages' ) ),
1705          'search_items'             => array( __( 'Search Posts' ), __( 'Search Pages' ) ),
1706          'not_found'                => array( __( 'No posts found.' ), __( 'No pages found.' ) ),
1707          'not_found_in_trash'       => array( __( 'No posts found in Trash.' ), __( 'No pages found in Trash.' ) ),
1708          'parent_item_colon'        => array( null, __( 'Parent Page:' ) ),
1709          'all_items'                => array( __( 'All Posts' ), __( 'All Pages' ) ),
1710          'archives'                 => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
1711          'attributes'               => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
1712          'insert_into_item'         => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
1713          'uploaded_to_this_item'    => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
1714          'featured_image'           => array( _x( 'Featured image', 'post' ), _x( 'Featured image', 'page' ) ),
1715          'set_featured_image'       => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
1716          'remove_featured_image'    => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
1717          'use_featured_image'       => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
1718          'filter_items_list'        => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
1719          'items_list_navigation'    => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
1720          'items_list'               => array( __( 'Posts list' ), __( 'Pages list' ) ),
1721          'item_published'           => array( __( 'Post published.' ), __( 'Page published.' ) ),
1722          'item_published_privately' => array( __( 'Post published privately.' ), __( 'Page published privately.' ) ),
1723          'item_reverted_to_draft'   => array( __( 'Post reverted to draft.' ), __( 'Page reverted to draft.' ) ),
1724          'item_scheduled'           => array( __( 'Post scheduled.' ), __( 'Page scheduled.' ) ),
1725          'item_updated'             => array( __( 'Post updated.' ), __( 'Page updated.' ) ),
1726      );
1727      $nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];
1728  
1729      $labels = _get_custom_object_labels( $post_type_object, $nohier_vs_hier_defaults );
1730  
1731      $post_type = $post_type_object->name;
1732  
1733      $default_labels = clone $labels;
1734  
1735      /**
1736       * Filters the labels of a specific post type.
1737       *
1738       * The dynamic portion of the hook name, `$post_type`, refers to
1739       * the post type slug.
1740       *
1741       * @since 3.5.0
1742       *
1743       * @see get_post_type_labels() for the full list of labels.
1744       *
1745       * @param object $labels Object with labels for the post type as member variables.
1746       */
1747      $labels = apply_filters( "post_type_labels_{$post_type}", $labels );
1748  
1749      // Ensure that the filtered labels contain all required default values.
1750      $labels = (object) array_merge( (array) $default_labels, (array) $labels );
1751  
1752      return $labels;
1753  }
1754  
1755  /**
1756   * Build an object with custom-something object (post type, taxonomy) labels
1757   * out of a custom-something object
1758   *
1759   * @since 3.0.0
1760   * @access private
1761   *
1762   * @param object $object                  A custom-something object.
1763   * @param array  $nohier_vs_hier_defaults Hierarchical vs non-hierarchical default labels.
1764   * @return object Object containing labels for the given custom-something object.
1765   */
1766  function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
1767      $object->labels = (array) $object->labels;
1768  
1769      if ( isset( $object->label ) && empty( $object->labels['name'] ) ) {
1770          $object->labels['name'] = $object->label;
1771      }
1772  
1773      if ( ! isset( $object->labels['singular_name'] ) && isset( $object->labels['name'] ) ) {
1774          $object->labels['singular_name'] = $object->labels['name'];
1775      }
1776  
1777      if ( ! isset( $object->labels['name_admin_bar'] ) ) {
1778          $object->labels['name_admin_bar'] = isset( $object->labels['singular_name'] ) ? $object->labels['singular_name'] : $object->name;
1779      }
1780  
1781      if ( ! isset( $object->labels['menu_name'] ) && isset( $object->labels['name'] ) ) {
1782          $object->labels['menu_name'] = $object->labels['name'];
1783      }
1784  
1785      if ( ! isset( $object->labels['all_items'] ) && isset( $object->labels['menu_name'] ) ) {
1786          $object->labels['all_items'] = $object->labels['menu_name'];
1787      }
1788  
1789      if ( ! isset( $object->labels['archives'] ) && isset( $object->labels['all_items'] ) ) {
1790          $object->labels['archives'] = $object->labels['all_items'];
1791      }
1792  
1793      $defaults = array();
1794      foreach ( $nohier_vs_hier_defaults as $key => $value ) {
1795          $defaults[ $key ] = $object->hierarchical ? $value[1] : $value[0];
1796      }
1797      $labels         = array_merge( $defaults, $object->labels );
1798      $object->labels = (object) $object->labels;
1799  
1800      return (object) $labels;
1801  }
1802  
1803  /**
1804   * Add submenus for post types.
1805   *
1806   * @access private
1807   * @since 3.1.0
1808   */
1809  function _add_post_type_submenus() {
1810      foreach ( get_post_types( array( 'show_ui' => true ) ) as $ptype ) {
1811          $ptype_obj = get_post_type_object( $ptype );
1812          // Sub-menus only.
1813          if ( ! $ptype_obj->show_in_menu || true === $ptype_obj->show_in_menu ) {
1814              continue;
1815          }
1816          add_submenu_page( $ptype_obj->show_in_menu, $ptype_obj->labels->name, $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, "edit.php?post_type=$ptype" );
1817      }
1818  }
1819  
1820  /**
1821   * Registers support of certain features for a post type.
1822   *
1823   * All core features are directly associated with a functional area of the edit
1824   * screen, such as the editor or a meta box. Features include: 'title', 'editor',
1825   * 'comments', 'revisions', 'trackbacks', 'author', 'excerpt', 'page-attributes',
1826   * 'thumbnail', 'custom-fields', and 'post-formats'.
1827   *
1828   * Additionally, the 'revisions' feature dictates whether the post type will
1829   * store revisions, and the 'comments' feature dictates whether the comments
1830   * count will show on the edit screen.
1831   *
1832   * A third, optional parameter can also be passed along with a feature to provide
1833   * additional information about supporting that feature.
1834   *
1835   * Example usage:
1836   *
1837   *     add_post_type_support( 'my_post_type', 'comments' );
1838   *     add_post_type_support( 'my_post_type', array(
1839   *         'author', 'excerpt',
1840   *     ) );
1841   *     add_post_type_support( 'my_post_type', 'my_feature', array(
1842   *         'field' => 'value',
1843   *     ) );
1844   *
1845   * @since 3.0.0
1846   * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
1847   *              by adding it to the function signature.
1848   *
1849   * @global array $_wp_post_type_features
1850   *
1851   * @param string       $post_type The post type for which to add the feature.
1852   * @param string|array $feature   The feature being added, accepts an array of
1853   *                                feature strings or a single string.
1854   * @param mixed        ...$args   Optional extra arguments to pass along with certain features.
1855   */
1856  function add_post_type_support( $post_type, $feature, ...$args ) {
1857      global $_wp_post_type_features;
1858  
1859      $features = (array) $feature;
1860      foreach ( $features as $feature ) {
1861          if ( $args ) {
1862              $_wp_post_type_features[ $post_type ][ $feature ] = $args;
1863          } else {
1864              $_wp_post_type_features[ $post_type ][ $feature ] = true;
1865          }
1866      }
1867  }
1868  
1869  /**
1870   * Remove support for a feature from a post type.
1871   *
1872   * @since 3.0.0
1873   *
1874   * @global array $_wp_post_type_features
1875   *
1876   * @param string $post_type The post type for which to remove the feature.
1877   * @param string $feature   The feature being removed.
1878   */
1879  function remove_post_type_support( $post_type, $feature ) {
1880      global $_wp_post_type_features;
1881  
1882      unset( $_wp_post_type_features[ $post_type ][ $feature ] );
1883  }
1884  
1885  /**
1886   * Get all the post type features
1887   *
1888   * @since 3.4.0
1889   *
1890   * @global array $_wp_post_type_features
1891   *
1892   * @param string $post_type The post type.
1893   * @return array Post type supports list.
1894   */
1895  function get_all_post_type_supports( $post_type ) {
1896      global $_wp_post_type_features;
1897  
1898      if ( isset( $_wp_post_type_features[ $post_type ] ) ) {
1899          return $_wp_post_type_features[ $post_type ];
1900      }
1901  
1902      return array();
1903  }
1904  
1905  /**
1906   * Check a post type's support for a given feature.
1907   *
1908   * @since 3.0.0
1909   *
1910   * @global array $_wp_post_type_features
1911   *
1912   * @param string $post_type The post type being checked.
1913   * @param string $feature   The feature being checked.
1914   * @return bool Whether the post type supports the given feature.
1915   */
1916  function post_type_supports( $post_type, $feature ) {
1917      global $_wp_post_type_features;
1918  
1919      return ( isset( $_wp_post_type_features[ $post_type ][ $feature ] ) );
1920  }
1921  
1922  /**
1923   * Retrieves a list of post type names that support a specific feature.
1924   *
1925   * @since 4.5.0
1926   *
1927   * @global array $_wp_post_type_features Post type features
1928   *
1929   * @param array|string $feature  Single feature or an array of features the post types should support.
1930   * @param string       $operator Optional. The logical operation to perform. 'or' means
1931   *                               only one element from the array needs to match; 'and'
1932   *                               means all elements must match; 'not' means no elements may
1933   *                               match. Default 'and'.
1934   * @return string[] A list of post type names.
1935   */
1936  function get_post_types_by_support( $feature, $operator = 'and' ) {
1937      global $_wp_post_type_features;
1938  
1939      $features = array_fill_keys( (array) $feature, true );
1940  
1941      return array_keys( wp_filter_object_list( $_wp_post_type_features, $features, $operator ) );
1942  }
1943  
1944  /**
1945   * Update the post type for the post ID.
1946   *
1947   * The page or post cache will be cleaned for the post ID.
1948   *
1949   * @since 2.5.0
1950   *
1951   * @global wpdb $wpdb WordPress database abstraction object.
1952   *
1953   * @param int    $post_id   Optional. Post ID to change post type. Default 0.
1954   * @param string $post_type Optional. Post type. Accepts 'post' or 'page' to
1955   *                          name a few. Default 'post'.
1956   * @return int|false Amount of rows changed. Should be 1 for success and 0 for failure.
1957   */
1958  function set_post_type( $post_id = 0, $post_type = 'post' ) {
1959      global $wpdb;
1960  
1961      $post_type = sanitize_post_field( 'post_type', $post_type, $post_id, 'db' );
1962      $return    = $wpdb->update( $wpdb->posts, array( 'post_type' => $post_type ), array( 'ID' => $post_id ) );
1963  
1964      clean_post_cache( $post_id );
1965  
1966      return $return;
1967  }
1968  
1969  /**
1970   * Determines whether a post type is considered "viewable".
1971   *
1972   * For built-in post types such as posts and pages, the 'public' value will be evaluated.
1973   * For all others, the 'publicly_queryable' value will be used.
1974   *
1975   * @since 4.4.0
1976   * @since 4.5.0 Added the ability to pass a post type name in addition to object.
1977   * @since 4.6.0 Converted the `$post_type` parameter to accept a `WP_Post_Type` object.
1978   *
1979   * @param string|WP_Post_Type $post_type Post type name or object.
1980   * @return bool Whether the post type should be considered viewable.
1981   */
1982  function is_post_type_viewable( $post_type ) {
1983      if ( is_scalar( $post_type ) ) {
1984          $post_type = get_post_type_object( $post_type );
1985          if ( ! $post_type ) {
1986              return false;
1987          }
1988      }
1989  
1990      return $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );
1991  }
1992  
1993  /**
1994   * Retrieves an array of the latest posts, or posts matching the given criteria.
1995   *
1996   * The defaults are as follows:
1997   *
1998   * @since 1.2.0
1999   *
2000   * @see WP_Query::parse_query()
2001   *
2002   * @param array $args {
2003   *     Optional. Arguments to retrieve posts. See WP_Query::parse_query() for all
2004   *     available arguments.
2005   *
2006   *     @type int        $numberposts      Total number of posts to retrieve. Is an alias of $posts_per_page
2007   *                                        in WP_Query. Accepts -1 for all. Default 5.
2008   *     @type int|string $category         Category ID or comma-separated list of IDs (this or any children).
2009   *                                        Is an alias of $cat in WP_Query. Default 0.
2010   *     @type array      $include          An array of post IDs to retrieve, sticky posts will be included.
2011   *                                        Is an alias of $post__in in WP_Query. Default empty array.
2012   *     @type array      $exclude          An array of post IDs not to retrieve. Default empty array.
2013   *     @type bool       $suppress_filters Whether to suppress filters. Default true.
2014   * }
2015   * @return WP_Post[]|int[] Array of post objects or post IDs.
2016   */
2017  function get_posts( $args = null ) {
2018      $defaults = array(
2019          'numberposts'      => 5,
2020          'category'         => 0,
2021          'orderby'          => 'date',
2022          'order'            => 'DESC',
2023          'include'          => array(),
2024          'exclude'          => array(),
2025          'meta_key'         => '',
2026          'meta_value'       => '',
2027          'post_type'        => 'post',
2028          'suppress_filters' => true,
2029      );
2030  
2031      $parsed_args = wp_parse_args( $args, $defaults );
2032      if ( empty( $parsed_args['post_status'] ) ) {
2033          $parsed_args['post_status'] = ( 'attachment' === $parsed_args['post_type'] ) ? 'inherit' : 'publish';
2034      }
2035      if ( ! empty( $parsed_args['numberposts'] ) && empty( $parsed_args['posts_per_page'] ) ) {
2036          $parsed_args['posts_per_page'] = $parsed_args['numberposts'];
2037      }
2038      if ( ! empty( $parsed_args['category'] ) ) {
2039          $parsed_args['cat'] = $parsed_args['category'];
2040      }
2041      if ( ! empty( $parsed_args['include'] ) ) {
2042          $incposts                      = wp_parse_id_list( $parsed_args['include'] );
2043          $parsed_args['posts_per_page'] = count( $incposts );  // Only the number of posts included.
2044          $parsed_args['post__in']       = $incposts;
2045      } elseif ( ! empty( $parsed_args['exclude'] ) ) {
2046          $parsed_args['post__not_in'] = wp_parse_id_list( $parsed_args['exclude'] );
2047      }
2048  
2049      $parsed_args['ignore_sticky_posts'] = true;
2050      $parsed_args['no_found_rows']       = true;
2051  
2052      $get_posts = new WP_Query;
2053      return $get_posts->query( $parsed_args );
2054  
2055  }
2056  
2057  //
2058  // Post meta functions.
2059  //
2060  
2061  /**
2062   * Adds a meta field to the given post.
2063   *
2064   * Post meta data is called "Custom Fields" on the Administration Screen.
2065   *
2066   * @since 1.5.0
2067   *
2068   * @param int    $post_id    Post ID.
2069   * @param string $meta_key   Metadata name.
2070   * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
2071   * @param bool   $unique     Optional. Whether the same key should not be added.
2072   *                           Default false.
2073   * @return int|false Meta ID on success, false on failure.
2074   */
2075  function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
2076      // Make sure meta is added to the post, not a revision.
2077      $the_post = wp_is_post_revision( $post_id );
2078      if ( $the_post ) {
2079          $post_id = $the_post;
2080      }
2081  
2082      return add_metadata( 'post', $post_id, $meta_key, $meta_value, $unique );
2083  }
2084  
2085  /**
2086   * Deletes a post meta field for the given post ID.
2087   *
2088   * You can match based on the key, or key and value. Removing based on key and
2089   * value, will keep from removing duplicate metadata with the same key. It also
2090   * allows removing all metadata matching the key, if needed.
2091   *
2092   * @since 1.5.0
2093   *
2094   * @param int    $post_id    Post ID.
2095   * @param string $meta_key   Metadata name.
2096   * @param mixed  $meta_value Optional. Metadata value. If provided,
2097   *                           rows will only be removed that match the value.
2098   *                           Must be serializable if non-scalar. Default empty.
2099   * @return bool True on success, false on failure.
2100   */
2101  function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
2102      // Make sure meta is added to the post, not a revision.
2103      $the_post = wp_is_post_revision( $post_id );
2104      if ( $the_post ) {
2105          $post_id = $the_post;
2106      }
2107  
2108      return delete_metadata( 'post', $post_id, $meta_key, $meta_value );
2109  }
2110  
2111  /**
2112   * Retrieves a post meta field for the given post ID.
2113   *
2114   * @since 1.5.0
2115   *
2116   * @param int    $post_id Post ID.
2117   * @param string $key     Optional. The meta key to retrieve. By default,
2118   *                        returns data for all keys. Default empty.
2119   * @param bool   $single  Optional. Whether to return a single value.
2120   *                        This parameter has no effect if $key is not specified.
2121   *                        Default false.
2122   * @return mixed An array if $single is false. The value of the meta field
2123   *               if $single is true. False for an invalid $post_id.
2124   */
2125  function get_post_meta( $post_id, $key = '', $single = false ) {
2126      return get_metadata( 'post', $post_id, $key, $single );
2127  }
2128  
2129  /**
2130   * Updates a post meta field based on the given post ID.
2131   *
2132   * Use the `$prev_value` parameter to differentiate between meta fields with the
2133   * same key and post ID.
2134   *
2135   * If the meta field for the post does not exist, it will be added and its ID returned.
2136   *
2137   * Can be used in place of add_post_meta().
2138   *
2139   * @since 1.5.0
2140   *
2141   * @param int    $post_id    Post ID.
2142   * @param string $meta_key   Metadata key.
2143   * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
2144   * @param mixed  $prev_value Optional. Previous value to check before updating.
2145   *                           If specified, only update existing metadata entries with
2146   *                           this value. Otherwise, update all entries. Default empty.
2147   * @return int|bool Meta ID if the key didn't exist, true on successful update,
2148   *                  false on failure or if the value passed to the function
2149   *                  is the same as the one that is already in the database.
2150   */
2151  function update_post_meta( $post_id, $meta_key, $meta_value, $prev_value = '' ) {
2152      // Make sure meta is added to the post, not a revision.
2153      $the_post = wp_is_post_revision( $post_id );
2154      if ( $the_post ) {
2155          $post_id = $the_post;
2156      }
2157  
2158      return update_metadata( 'post', $post_id, $meta_key, $meta_value, $prev_value );
2159  }
2160  
2161  /**
2162   * Deletes everything from post meta matching the given meta key.
2163   *
2164   * @since 2.3.0
2165   *
2166   * @param string $post_meta_key Key to search for when deleting.
2167   * @return bool Whether the post meta key was deleted from the database.
2168   */
2169  function delete_post_meta_by_key( $post_meta_key ) {
2170      return delete_metadata( 'post', null, $post_meta_key, '', true );
2171  }
2172  
2173  /**
2174   * Registers a meta key for posts.
2175   *
2176   * @since 4.9.8
2177   *
2178   * @param string $post_type Post type to register a meta key for. Pass an empty string
2179   *                          to register the meta key across all existing post types.
2180   * @param string $meta_key  The meta key to register.
2181   * @param array  $args      Data used to describe the meta key when registered. See
2182   *                          {@see register_meta()} for a list of supported arguments.
2183   * @return bool True if the meta key was successfully registered, false if not.
2184   */
2185  function register_post_meta( $post_type, $meta_key, array $args ) {
2186      $args['object_subtype'] = $post_type;
2187  
2188      return register_meta( 'post', $meta_key, $args );
2189  }
2190  
2191  /**
2192   * Unregisters a meta key for posts.
2193   *
2194   * @since 4.9.8
2195   *
2196   * @param string $post_type Post type the meta key is currently registered for. Pass
2197   *                          an empty string if the meta key is registered across all
2198   *                          existing post types.
2199   * @param string $meta_key  The meta key to unregister.
2200   * @return bool True on success, false if the meta key was not previously registered.
2201   */
2202  function unregister_post_meta( $post_type, $meta_key ) {
2203      return unregister_meta_key( 'post', $meta_key, $post_type );
2204  }
2205  
2206  /**
2207   * Retrieve post meta fields, based on post ID.
2208   *
2209   * The post meta fields are retrieved from the cache where possible,
2210   * so the function is optimized to be called more than once.
2211   *
2212   * @since 1.2.0
2213   *
2214   * @param int $post_id Optional. Post ID. Default is ID of the global $post.
2215   * @return array Post meta for the given post.
2216   */
2217  function get_post_custom( $post_id = 0 ) {
2218      $post_id = absint( $post_id );
2219      if ( ! $post_id ) {
2220          $post_id = get_the_ID();
2221      }
2222  
2223      return get_post_meta( $post_id );
2224  }
2225  
2226  /**
2227   * Retrieve meta field names for a post.
2228   *
2229   * If there are no meta fields, then nothing (null) will be returned.
2230   *
2231   * @since 1.2.0
2232   *
2233   * @param int $post_id Optional. Post ID. Default is ID of the global $post.
2234   * @return array|void Array of the keys, if retrieved.
2235   */
2236  function get_post_custom_keys( $post_id = 0 ) {
2237      $custom = get_post_custom( $post_id );
2238  
2239      if ( ! is_array( $custom ) ) {
2240          return;
2241      }
2242  
2243      $keys = array_keys( $custom );
2244      if ( $keys ) {
2245          return $keys;
2246      }
2247  }
2248  
2249  /**
2250   * Retrieve values for a custom post field.
2251   *
2252   * The parameters must not be considered optional. All of the post meta fields
2253   * will be retrieved and only the meta field key values returned.
2254   *
2255   * @since 1.2.0
2256   *
2257   * @param string $key     Optional. Meta field key. Default empty.
2258   * @param int    $post_id Optional. Post ID. Default is ID of the global $post.
2259   * @return array|null Meta field values.
2260   */
2261  function get_post_custom_values( $key = '', $post_id = 0 ) {
2262      if ( ! $key ) {
2263          return null;
2264      }
2265  
2266      $custom = get_post_custom( $post_id );
2267  
2268      return isset( $custom[ $key ] ) ? $custom[ $key ] : null;
2269  }
2270  
2271  /**
2272   * Determines whether a post is sticky.
2273   *
2274   * Sticky posts should remain at the top of The Loop. If the post ID is not
2275   * given, then The Loop ID for the current post will be used.
2276   *
2277   * For more information on this and similar theme functions, check out
2278   * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
2279   * Conditional Tags} article in the Theme Developer Handbook.
2280   *
2281   * @since 2.7.0
2282   *
2283   * @param int $post_id Optional. Post ID. Default is ID of the global $post.
2284   * @return bool Whether post is sticky.
2285   */
2286  function is_sticky( $post_id = 0 ) {
2287      $post_id = absint( $post_id );
2288  
2289      if ( ! $post_id ) {
2290          $post_id = get_the_ID();
2291      }
2292  
2293      $stickies = get_option( 'sticky_posts' );
2294  
2295      if ( is_array( $stickies ) ) {
2296          $stickies  = array_map( 'intval', $stickies );
2297          $is_sticky = in_array( $post_id, $stickies, true );
2298      } else {
2299          $is_sticky = false;
2300      }
2301  
2302      /**
2303       * Filters whether a post is sticky.
2304       *
2305       * @since 5.3.0
2306       *
2307       * @param bool $is_sticky Whether a post is sticky.
2308       * @param int  $post_id   Post ID.
2309       */
2310      return apply_filters( 'is_sticky', $is_sticky, $post_id );
2311  }
2312  
2313  /**
2314   * Sanitize every post field.
2315   *
2316   * If the context is 'raw', then the post object or array will get minimal
2317   * sanitization of the integer fields.
2318   *
2319   * @since 2.3.0
2320   *
2321   * @see sanitize_post_field()
2322   *
2323   * @param object|WP_Post|array $post    The Post Object or Array
2324   * @param string               $context Optional. How to sanitize post fields.
2325   *                                      Accepts 'raw', 'edit', 'db', or 'display'.
2326   *                                      Default 'display'.
2327   * @return object|WP_Post|array The now sanitized Post Object or Array (will be the
2328   *                              same type as $post).
2329   */
2330  function sanitize_post( $post, $context = 'display' ) {
2331      if ( is_object( $post ) ) {
2332          // Check if post already filtered for this context.
2333          if ( isset( $post->filter ) && $context == $post->filter ) {
2334              return $post;
2335          }
2336          if ( ! isset( $post->ID ) ) {
2337              $post->ID = 0;
2338          }
2339          foreach ( array_keys( get_object_vars( $post ) ) as $field ) {
2340              $post->$field = sanitize_post_field( $field, $post->$field, $post->ID, $context );
2341          }
2342          $post->filter = $context;
2343      } elseif ( is_array( $post ) ) {
2344          // Check if post already filtered for this context.
2345          if ( isset( $post['filter'] ) && $context == $post['filter'] ) {
2346              return $post;
2347          }
2348          if ( ! isset( $post['ID'] ) ) {
2349              $post['ID'] = 0;
2350          }
2351          foreach ( array_keys( $post ) as $field ) {
2352              $post[ $field ] = sanitize_post_field( $field, $post[ $field ], $post['ID'], $context );
2353          }
2354          $post['filter'] = $context;
2355      }
2356      return $post;
2357  }
2358  
2359  /**
2360   * Sanitizes a post field based on context.
2361   *
2362   * Possible context values are:  'raw', 'edit', 'db', 'display', 'attribute' and
2363   * 'js'. The 'display' context is used by default. 'attribute' and 'js' contexts
2364   * are treated like 'display' when calling filters.
2365   *
2366   * @since 2.3.0
2367   * @since 4.4.0 Like `sanitize_post()`, `$context` defaults to 'display'.
2368   *
2369   * @param string $field   The Post Object field name.
2370   * @param mixed  $value   The Post Object value.
2371   * @param int    $post_id Post ID.
2372   * @param string $context Optional. How to sanitize the field. Possible values are 'raw', 'edit',
2373   *                        'db', 'display', 'attribute' and 'js'. Default 'display'.
2374   * @return mixed Sanitized value.
2375   */
2376  function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
2377      $int_fields = array( 'ID', 'post_parent', 'menu_order' );
2378      if ( in_array( $field, $int_fields, true ) ) {
2379          $value = (int) $value;
2380      }
2381  
2382      // Fields which contain arrays of integers.
2383      $array_int_fields = array( 'ancestors' );
2384      if ( in_array( $field, $array_int_fields, true ) ) {
2385          $value = array_map( 'absint', $value );
2386          return $value;
2387      }
2388  
2389      if ( 'raw' === $context ) {
2390          return $value;
2391      }
2392  
2393      $prefixed = false;
2394      if ( false !== strpos( $field, 'post_' ) ) {
2395          $prefixed        = true;
2396          $field_no_prefix = str_replace( 'post_', '', $field );
2397      }
2398  
2399      if ( 'edit' === $context ) {
2400          $format_to_edit = array( 'post_content', 'post_excerpt', 'post_title', 'post_password' );
2401  
2402          if ( $prefixed ) {
2403  
2404              /**
2405               * Filters the value of a specific post field to edit.
2406               *
2407               * The dynamic portion of the hook name, `$field`, refers to the post
2408               * field name.
2409               *
2410               * @since 2.3.0
2411               *
2412               * @param mixed $value   Value of the post field.
2413               * @param int   $post_id Post ID.
2414               */
2415              $value = apply_filters( "edit_{$field}", $value, $post_id );
2416  
2417              /**
2418               * Filters the value of a specific post field to edit.
2419               *
2420               * The dynamic portion of the hook name, `$field_no_prefix`, refers to
2421               * the post field name.
2422               *
2423               * @since 2.3.0
2424               *
2425               * @param mixed $value   Value of the post field.
2426               * @param int   $post_id Post ID.
2427               */
2428              $value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id );
2429          } else {
2430              $value = apply_filters( "edit_post_{$field}", $value, $post_id );
2431          }
2432  
2433          if ( in_array( $field, $format_to_edit, true ) ) {
2434              if ( 'post_content' === $field ) {
2435                  $value = format_to_edit( $value, user_can_richedit() );
2436              } else {
2437                  $value = format_to_edit( $value );
2438              }
2439          } else {
2440              $value = esc_attr( $value );
2441          }
2442      } elseif ( 'db' === $context ) {
2443          if ( $prefixed ) {
2444  
2445              /**
2446               * Filters the value of a specific post field before saving.
2447               *
2448               * The dynamic portion of the hook name, `$field`, refers to the post
2449               * field name.
2450               *
2451               * @since 2.3.0
2452               *
2453               * @param mixed $value Value of the post field.
2454               */
2455              $value = apply_filters( "pre_{$field}", $value );
2456  
2457              /**
2458               * Filters the value of a specific field before saving.
2459               *
2460               * The dynamic portion of the hook name, `$field_no_prefix`, refers
2461               * to the post field name.
2462               *
2463               * @since 2.3.0
2464               *
2465               * @param mixed $value Value of the post field.
2466               */
2467              $value = apply_filters( "{$field_no_prefix}_save_pre", $value );
2468          } else {
2469              $value = apply_filters( "pre_post_{$field}", $value );
2470  
2471              /**
2472               * Filters the value of a specific post field before saving.
2473               *
2474               * The dynamic portion of the hook name, `$field`, refers to the post
2475               * field name.
2476               *
2477               * @since 2.3.0
2478               *
2479               * @param mixed $value Value of the post field.
2480               */
2481              $value = apply_filters( "{$field}_pre", $value );
2482          }
2483      } else {
2484  
2485          // Use display filters by default.
2486          if ( $prefixed ) {
2487  
2488              /**
2489               * Filters the value of a specific post field for display.
2490               *
2491               * The dynamic portion of the hook name, `$field`, refers to the post
2492               * field name.
2493               *
2494               * @since 2.3.0
2495               *
2496               * @param mixed  $value   Value of the prefixed post field.
2497               * @param int    $post_id Post ID.
2498               * @param string $context Context for how to sanitize the field. Possible
2499               *                        values include 'edit', 'display',
2500               *                        'attribute' and 'js'.
2501               */
2502              $value = apply_filters( "{$field}", $value, $post_id, $context );
2503          } else {
2504              $value = apply_filters( "post_{$field}", $value, $post_id, $context );
2505          }
2506  
2507          if ( 'attribute' === $context ) {
2508              $value = esc_attr( $value );
2509          } elseif ( 'js' === $context ) {
2510              $value = esc_js( $value );
2511          }
2512      }
2513  
2514      return $value;
2515  }
2516  
2517  /**
2518   * Make a post sticky.
2519   *
2520   * Sticky posts should be displayed at the top of the front page.
2521   *
2522   * @since 2.7.0
2523   *
2524   * @param int $post_id Post ID.
2525   */
2526  function stick_post( $post_id ) {
2527      $post_id  = (int) $post_id;
2528      $stickies = get_option( 'sticky_posts' );
2529  
2530      if ( ! is_array( $stickies ) ) {
2531          $stickies = array();
2532      }
2533  
2534      $stickies = array_map( 'intval', $stickies );
2535  
2536      if ( ! in_array( $post_id, $stickies, true ) ) {
2537          $stickies[] = $post_id;
2538      }
2539  
2540      $updated = update_option( 'sticky_posts', $stickies );
2541  
2542      if ( $updated ) {
2543          /**
2544           * Fires once a post has been added to the sticky list.
2545           *
2546           * @since 4.6.0
2547           *
2548           * @param int $post_id ID of the post that was stuck.
2549           */
2550          do_action( 'post_stuck', $post_id );
2551      }
2552  }
2553  
2554  /**
2555   * Un-stick a post.
2556   *
2557   * Sticky posts should be displayed at the top of the front page.
2558   *
2559   * @since 2.7.0
2560   *
2561   * @param int $post_id Post ID.
2562   */
2563  function unstick_post( $post_id ) {
2564      $post_id  = (int) $post_id;
2565      $stickies = get_option( 'sticky_posts' );
2566  
2567      if ( ! is_array( $stickies ) ) {
2568          return;
2569      }
2570  
2571      $stickies = array_map( 'intval', $stickies );
2572  
2573      if ( ! in_array( $post_id, $stickies, true ) ) {
2574          return;
2575      }
2576  
2577      $offset = array_search( $post_id, $stickies, true );
2578      if ( false === $offset ) {
2579          return;
2580      }
2581  
2582      array_splice( $stickies, $offset, 1 );
2583  
2584      $updated = update_option( 'sticky_posts', $stickies );
2585  
2586      if ( $updated ) {
2587          /**
2588           * Fires once a post has been removed from the sticky list.
2589           *
2590           * @since 4.6.0
2591           *
2592           * @param int $post_id ID of the post that was unstuck.
2593           */
2594          do_action( 'post_unstuck', $post_id );
2595      }
2596  }
2597  
2598  /**
2599   * Return the cache key for wp_count_posts() based on the passed arguments.
2600   *
2601   * @since 3.9.0
2602   * @access private
2603   *
2604   * @param string $type Optional. Post type to retrieve count Default 'post'.
2605   * @param string $perm Optional. 'readable' or empty. Default empty.
2606   * @return string The cache key.
2607   */
2608  function _count_posts_cache_key( $type = 'post', $perm = '' ) {
2609      $cache_key = 'posts-' . $type;
2610  
2611      if ( 'readable' === $perm && is_user_logged_in() ) {
2612          $post_type_object = get_post_type_object( $type );
2613  
2614          if ( $post_type_object && ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
2615              $cache_key .= '_' . $perm . '_' . get_current_user_id();
2616          }
2617      }
2618  
2619      return $cache_key;
2620  }
2621  
2622  /**
2623   * Count number of posts of a post type and if user has permissions to view.
2624   *
2625   * This function provides an efficient method of finding the amount of post's
2626   * type a blog has. Another method is to count the amount of items in
2627   * get_posts(), but that method has a lot of overhead with doing so. Therefore,
2628   * when developing for 2.5+, use this function instead.
2629   *
2630   * The $perm parameter checks for 'readable' value and if the user can read
2631   * private posts, it will display that for the user that is signed in.
2632   *
2633   * @since 2.5.0
2634   *
2635   * @global wpdb $wpdb WordPress database abstraction object.
2636   *
2637   * @param string $type Optional. Post type to retrieve count. Default 'post'.
2638   * @param string $perm Optional. 'readable' or empty. Default empty.
2639   * @return object Number of posts for each status.
2640   */
2641  function wp_count_posts( $type = 'post', $perm = '' ) {
2642      global $wpdb;
2643  
2644      if ( ! post_type_exists( $type ) ) {
2645          return new stdClass;
2646      }
2647  
2648      $cache_key = _count_posts_cache_key( $type, $perm );
2649  
2650      $counts = wp_cache_get( $cache_key, 'counts' );
2651      if ( false !== $counts ) {
2652          // We may have cached this before every status was registered.
2653          foreach ( get_post_stati() as $status ) {
2654              if ( ! isset( $counts->{$status} ) ) {
2655                  $counts->{$status} = 0;
2656              }
2657          }
2658  
2659          /** This filter is documented in wp-includes/post.php */
2660          return apply_filters( 'wp_count_posts', $counts, $type, $perm );
2661      }
2662  
2663      $query = "SELECT post_status, COUNT( * ) AS num_posts FROM {$wpdb->posts} WHERE post_type = %s";
2664  
2665      if ( 'readable' === $perm && is_user_logged_in() ) {
2666          $post_type_object = get_post_type_object( $type );
2667          if ( ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
2668              $query .= $wpdb->prepare(
2669                  " AND (post_status != 'private' OR ( post_author = %d AND post_status = 'private' ))",
2670                  get_current_user_id()
2671              );
2672          }
2673      }
2674  
2675      $query .= ' GROUP BY post_status';
2676  
2677      $results = (array) $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );
2678      $counts  = array_fill_keys( get_post_stati(), 0 );
2679  
2680      foreach ( $results as $row ) {
2681          $counts[ $row['post_status'] ] = $row['num_posts'];
2682      }
2683  
2684      $counts = (object) $counts;
2685      wp_cache_set( $cache_key, $counts, 'counts' );
2686  
2687      /**
2688       * Modify returned post counts by status for the current post type.
2689       *
2690       * @since 3.7.0
2691       *
2692       * @param object $counts An object containing the current post_type's post
2693       *                       counts by status.
2694       * @param string $type   Post type.
2695       * @param string $perm   The permission to determine if the posts are 'readable'
2696       *                       by the current user.
2697       */
2698      return apply_filters( 'wp_count_posts', $counts, $type, $perm );
2699  }
2700  
2701  /**
2702   * Count number of attachments for the mime type(s).
2703   *
2704   * If you set the optional mime_type parameter, then an array will still be
2705   * returned, but will only have the item you are looking for. It does not give
2706   * you the number of attachments that are children of a post. You can get that
2707   * by counting the number of children that post has.
2708   *
2709   * @since 2.5.0
2710   *
2711   * @global wpdb $wpdb WordPress database abstraction object.
2712   *
2713   * @param string|array $mime_type Optional. Array or comma-separated list of
2714   *                                MIME patterns. Default empty.
2715   * @return object An object containing the attachment counts by mime type.
2716   */
2717  function wp_count_attachments( $mime_type = '' ) {
2718      global $wpdb;
2719  
2720      $and   = wp_post_mime_type_where( $mime_type );
2721      $count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' $and GROUP BY post_mime_type", ARRAY_A );
2722  
2723      $counts = array();
2724      foreach ( (array) $count as $row ) {
2725          $counts[ $row['post_mime_type'] ] = $row['num_posts'];
2726      }
2727      $counts['trash'] = $wpdb->get_var( "SELECT COUNT( * ) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status = 'trash' $and" );
2728  
2729      /**
2730       * Modify returned attachment counts by mime type.
2731       *
2732       * @since 3.7.0
2733       *
2734       * @param object $counts    An object containing the attachment counts by
2735       *                          mime type.
2736       * @param string $mime_type The mime type pattern used to filter the attachments
2737       *                          counted.
2738       */
2739      return apply_filters( 'wp_count_attachments', (object) $counts, $mime_type );
2740  }
2741  
2742  /**
2743   * Get default post mime types.
2744   *
2745   * @since 2.9.0
2746   * @since 5.3.0 Added the 'Documents', 'Spreadsheets', and 'Archives' mime type groups.
2747   *
2748   * @return array List of post mime types.
2749   */
2750  function get_post_mime_types() {
2751      $post_mime_types = array(   // array( adj, noun )
2752          'image'       => array(
2753              __( 'Images' ),
2754              __( 'Manage Images' ),
2755              /* translators: %s: Number of images. */
2756              _n_noop(
2757                  'Image <span class="count">(%s)</span>',
2758                  'Images <span class="count">(%s)</span>'
2759              ),
2760          ),
2761          'audio'       => array(
2762              __( 'Audio' ),
2763              __( 'Manage Audio' ),
2764              /* translators: %s: Number of audio files. */
2765              _n_noop(
2766                  'Audio <span class="count">(%s)</span>',
2767                  'Audio <span class="count">(%s)</span>'
2768              ),
2769          ),
2770          'video'       => array(
2771              __( 'Video' ),
2772              __( 'Manage Video' ),
2773              /* translators: %s: Number of video files. */
2774              _n_noop(
2775                  'Video <span class="count">(%s)</span>',
2776                  'Video <span class="count">(%s)</span>'
2777              ),
2778          ),
2779          'document'    => array(
2780              __( 'Documents' ),
2781              __( 'Manage Documents' ),
2782              /* translators: %s: Number of documents. */
2783              _n_noop(
2784                  'Document <span class="count">(%s)</span>',
2785                  'Documents <span class="count">(%s)</span>'
2786              ),
2787          ),
2788          'spreadsheet' => array(
2789              __( 'Spreadsheets' ),
2790              __( 'Manage Spreadsheets' ),
2791              /* translators: %s: Number of spreadsheets. */
2792              _n_noop(
2793                  'Spreadsheet <span class="count">(%s)</span>',
2794                  'Spreadsheets <span class="count">(%s)</span>'
2795              ),
2796          ),
2797          'archive'     => array(
2798              _x( 'Archives', 'file type group' ),
2799              __( 'Manage Archives' ),
2800              /* translators: %s: Number of archives. */
2801              _n_noop(
2802                  'Archive <span class="count">(%s)</span>',
2803                  'Archives <span class="count">(%s)</span>'
2804              ),
2805          ),
2806      );
2807  
2808      $ext_types  = wp_get_ext_types();
2809      $mime_types = wp_get_mime_types();
2810  
2811      foreach ( $post_mime_types as $group => $labels ) {
2812          if ( in_array( $group, array( 'image', 'audio', 'video' ), true ) ) {
2813              continue;
2814          }
2815  
2816          if ( ! isset( $ext_types[ $group ] ) ) {
2817              unset( $post_mime_types[ $group ] );
2818              continue;
2819          }
2820  
2821          $group_mime_types = array();
2822          foreach ( $ext_types[ $group ] as $extension ) {
2823              foreach ( $mime_types as $exts => $mime ) {
2824                  if ( preg_match( '!^(' . $exts . ')$!i', $extension ) ) {
2825                      $group_mime_types[] = $mime;
2826                      break;
2827                  }
2828              }
2829          }
2830          $group_mime_types = implode( ',', array_unique( $group_mime_types ) );
2831  
2832          $post_mime_types[ $group_mime_types ] = $labels;
2833          unset( $post_mime_types[ $group ] );
2834      }
2835  
2836      /**
2837       * Filters the default list of post mime types.
2838       *
2839       * @since 2.5.0
2840       *
2841       * @param array $post_mime_types Default list of post mime types.
2842       */
2843      return apply_filters( 'post_mime_types', $post_mime_types );
2844  }
2845  
2846  /**
2847   * Check a MIME-Type against a list.
2848   *
2849   * If the wildcard_mime_types parameter is a string, it must be comma separated
2850   * list. If the real_mime_types is a string, it is also comma separated to
2851   * create the list.
2852   *
2853   * @since 2.5.0
2854   *
2855   * @param string|array $wildcard_mime_types Mime types, e.g. audio/mpeg or image (same as image/*)
2856   *                                          or flash (same as *flash*).
2857   * @param string|array $real_mime_types     Real post mime type values.
2858   * @return array array(wildcard=>array(real types)).
2859   */
2860  function wp_match_mime_types( $wildcard_mime_types, $real_mime_types ) {
2861      $matches = array();
2862      if ( is_string( $wildcard_mime_types ) ) {
2863          $wildcard_mime_types = array_map( 'trim', explode( ',', $wildcard_mime_types ) );
2864      }
2865      if ( is_string( $real_mime_types ) ) {
2866          $real_mime_types = array_map( 'trim', explode( ',', $real_mime_types ) );
2867      }
2868  
2869      $patternses = array();
2870      $wild       = '[-._a-z0-9]*';
2871  
2872      foreach ( (array) $wildcard_mime_types as $type ) {
2873          $mimes = array_map( 'trim', explode( ',', $type ) );
2874          foreach ( $mimes as $mime ) {
2875              $regex = str_replace( '__wildcard__', $wild, preg_quote( str_replace( '*', '__wildcard__', $mime ) ) );
2876  
2877              $patternses[][ $type ] = "^$regex$";
2878  
2879              if ( false === strpos( $mime, '/' ) ) {
2880                  $patternses[][ $type ] = "^$regex/";
2881                  $patternses[][ $type ] = $regex;
2882              }
2883          }
2884      }
2885      asort( $patternses );
2886  
2887      foreach ( $patternses as $patterns ) {
2888          foreach ( $patterns as $type => $pattern ) {
2889              foreach ( (array) $real_mime_types as $real ) {
2890                  if ( preg_match( "#$pattern#", $real )
2891                      && ( empty( $matches[ $type ] ) || false === array_search( $real, $matches[ $type ], true ) )
2892                  ) {
2893                      $matches[ $type ][] = $real;
2894                  }
2895              }
2896          }
2897      }
2898  
2899      return $matches;
2900  }
2901  
2902  /**
2903   * Convert MIME types into SQL.
2904   *
2905   * @since 2.5.0
2906   *
2907   * @param string|array $post_mime_types List of mime types or comma separated string
2908   *                                      of mime types.
2909   * @param string       $table_alias     Optional. Specify a table alias, if needed.
2910   *                                      Default empty.
2911   * @return string The SQL AND clause for mime searching.
2912   */
2913  function wp_post_mime_type_where( $post_mime_types, $table_alias = '' ) {
2914      $where     = '';
2915      $wildcards = array( '', '%', '%/%' );
2916      if ( is_string( $post_mime_types ) ) {
2917          $post_mime_types = array_map( 'trim', explode( ',', $post_mime_types ) );
2918      }
2919  
2920      $wheres = array();
2921  
2922      foreach ( (array) $post_mime_types as $mime_type ) {
2923          $mime_type = preg_replace( '/\s/', '', $mime_type );
2924          $slashpos  = strpos( $mime_type, '/' );
2925          if ( false !== $slashpos ) {
2926              $mime_group    = preg_replace( '/[^-*.a-zA-Z0-9]/', '', substr( $mime_type, 0, $slashpos ) );
2927              $mime_subgroup = preg_replace( '/[^-*.+a-zA-Z0-9]/', '', substr( $mime_type, $slashpos + 1 ) );
2928              if ( empty( $mime_subgroup ) ) {
2929                  $mime_subgroup = '*';
2930              } else {
2931                  $mime_subgroup = str_replace( '/', '', $mime_subgroup );
2932              }
2933              $mime_pattern = "$mime_group/$mime_subgroup";
2934          } else {
2935              $mime_pattern = preg_replace( '/[^-*.a-zA-Z0-9]/', '', $mime_type );
2936              if ( false === strpos( $mime_pattern, '*' ) ) {
2937                  $mime_pattern .= '/*';
2938              }
2939          }
2940  
2941          $mime_pattern = preg_replace( '/\*+/', '%', $mime_pattern );
2942  
2943          if ( in_array( $mime_type, $wildcards, true ) ) {
2944              return '';
2945          }
2946  
2947          if ( false !== strpos( $mime_pattern, '%' ) ) {
2948              $wheres[] = empty( $table_alias ) ? "post_mime_type LIKE '$mime_pattern'" : "$table_alias.post_mime_type LIKE '$mime_pattern'";
2949          } else {
2950              $wheres[] = empty( $table_alias ) ? "post_mime_type = '$mime_pattern'" : "$table_alias.post_mime_type = '$mime_pattern'";
2951          }
2952      }
2953  
2954      if ( ! empty( $wheres ) ) {
2955          $where = ' AND (' . join( ' OR ', $wheres ) . ') ';
2956      }
2957  
2958      return $where;
2959  }
2960  
2961  /**
2962   * Trash or delete a post or page.
2963   *
2964   * When the post and page is permanently deleted, everything that is tied to
2965   * it is deleted also. This includes comments, post meta fields, and terms
2966   * associated with the post.
2967   *
2968   * The post or page is moved to Trash instead of permanently deleted unless
2969   * Trash is disabled, item is already in the Trash, or $force_delete is true.
2970   *
2971   * @since 1.0.0
2972   *
2973   * @global wpdb $wpdb WordPress database abstraction object.
2974   * @see wp_delete_attachment()
2975   * @see wp_trash_post()
2976   *
2977   * @param int  $postid       Optional. Post ID. Default 0.
2978   * @param bool $force_delete Optional. Whether to bypass Trash and force deletion.
2979   *                           Default false.
2980   * @return WP_Post|false|null Post data on success, false or null on failure.
2981   */
2982  function wp_delete_post( $postid = 0, $force_delete = false ) {
2983      global $wpdb;
2984  
2985      $post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $postid ) );
2986  
2987      if ( ! $post ) {
2988          return $post;
2989      }
2990  
2991      $post = get_post( $post );
2992  
2993      if ( ! $force_delete && ( 'post' === $post->post_type || 'page' === $post->post_type ) && 'trash' !== get_post_status( $postid ) && EMPTY_TRASH_DAYS ) {
2994          return wp_trash_post( $postid );
2995      }
2996  
2997      if ( 'attachment' === $post->post_type ) {
2998          return wp_delete_attachment( $postid, $force_delete );
2999      }
3000  
3001      /**
3002       * Filters whether a post deletion should take place.
3003       *
3004       * @since 4.4.0
3005       *
3006       * @param bool|null $delete       Whether to go forward with deletion.
3007       * @param WP_Post   $post         Post object.
3008       * @param bool      $force_delete Whether to bypass the Trash.
3009       */
3010      $check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
3011      if ( null !== $check ) {
3012          return $check;
3013      }
3014  
3015      /**
3016       * Fires before a post is deleted, at the start of wp_delete_post().
3017       *
3018       * @since 3.2.0
3019       * @since 5.5.0 Added the `$post` parameter.
3020       *
3021       * @see wp_delete_post()
3022       *
3023       * @param int     $postid Post ID.
3024       * @param WP_Post $post   Post object.
3025       */
3026      do_action( 'before_delete_post', $postid, $post );
3027  
3028      delete_post_meta( $postid, '_wp_trash_meta_status' );
3029      delete_post_meta( $postid, '_wp_trash_meta_time' );
3030  
3031      wp_delete_object_term_relationships( $postid, get_object_taxonomies( $post->post_type ) );
3032  
3033      $parent_data  = array( 'post_parent' => $post->post_parent );
3034      $parent_where = array( 'post_parent' => $postid );
3035  
3036      if ( is_post_type_hierarchical( $post->post_type ) ) {
3037          // Point children of this page to its parent, also clean the cache of affected children.
3038          $children_query = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type = %s", $postid, $post->post_type );
3039          $children       = $wpdb->get_results( $children_query );
3040          if ( $children ) {
3041              $wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
3042          }
3043      }
3044  
3045      // Do raw query. wp_get_post_revisions() is filtered.
3046      $revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
3047      // Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up.
3048      foreach ( $revision_ids as $revision_id ) {
3049          wp_delete_post_revision( $revision_id );
3050      }
3051  
3052      // Point all attachments to this post up one level.
3053      $wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) );
3054  
3055      wp_defer_comment_counting( true );
3056  
3057      $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $postid ) );
3058      foreach ( $comment_ids as $comment_id ) {
3059          wp_delete_comment( $comment_id, true );
3060      }
3061  
3062      wp_defer_comment_counting( false );
3063  
3064      $post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $postid ) );
3065      foreach ( $post_meta_ids as $mid ) {
3066          delete_metadata_by_mid( 'post', $mid );
3067      }
3068  
3069      /**
3070       * Fires immediately before a post is deleted from the database.
3071       *
3072       * @since 1.2.0
3073       * @since 5.5.0 Added the `$post` parameter.
3074       *
3075       * @param int     $postid Post ID.
3076       * @param WP_Post $post   Post object.
3077       */
3078      do_action( 'delete_post', $postid, $post );
3079  
3080      $result = $wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
3081      if ( ! $result ) {
3082          return false;
3083      }
3084  
3085      /**
3086       * Fires immediately after a post is deleted from the database.
3087       *
3088       * @since 2.2.0
3089       * @since 5.5.0 Added the `$post` parameter.
3090       *
3091       * @param int     $postid Post ID.
3092       * @param WP_Post $post   Post object.
3093       */
3094      do_action( 'deleted_post', $postid, $post );
3095  
3096      clean_post_cache( $post );
3097  
3098      if ( is_post_type_hierarchical( $post->post_type ) && $children ) {
3099          foreach ( $children as $child ) {
3100              clean_post_cache( $child );
3101          }
3102      }
3103  
3104      wp_clear_scheduled_hook( 'publish_future_post', array( $postid ) );
3105  
3106      /**
3107       * Fires after a post is deleted, at the conclusion of wp_delete_post().
3108       *
3109       * @since 3.2.0
3110       * @since 5.5.0 Added the `$post` parameter.
3111       *
3112       * @see wp_delete_post()
3113       *
3114       * @param int     $postid Post ID.
3115       * @param WP_Post $post   Post object.
3116       */
3117      do_action( 'after_delete_post', $postid, $post );
3118  
3119      return $post;
3120  }
3121  
3122  /**
3123   * Reset the page_on_front, show_on_front, and page_for_post settings when
3124   * a linked page is deleted or trashed.
3125   *
3126   * Also ensures the post is no longer sticky.
3127   *
3128   * @since 3.7.0
3129   * @access private
3130   *
3131   * @param int $post_id Post ID.
3132   */
3133  function _reset_front_page_settings_for_post( $post_id ) {
3134      $post = get_post( $post_id );
3135  
3136      if ( 'page' === $post->post_type ) {
3137          /*
3138           * If the page is defined in option page_on_front or post_for_posts,
3139           * adjust the corresponding options.
3140           */
3141          if ( get_option( 'page_on_front' ) == $post->ID ) {
3142              update_option( 'show_on_front', 'posts' );
3143              update_option( 'page_on_front', 0 );
3144          }
3145          if ( get_option( 'page_for_posts' ) == $post->ID ) {
3146              update_option( 'page_for_posts', 0 );
3147          }
3148      }
3149  
3150      unstick_post( $post->ID );
3151  }
3152  
3153  /**
3154   * Move a post or page to the Trash
3155   *
3156   * If Trash is disabled, the post or page is permanently deleted.
3157   *
3158   * @since 2.9.0
3159   *
3160   * @see wp_delete_post()
3161   *
3162   * @param int $post_id Optional. Post ID. Default is ID of the global $post
3163   *                     if EMPTY_TRASH_DAYS equals true.
3164   * @return WP_Post|false|null Post data on success, false or null on failure.
3165   */
3166  function wp_trash_post( $post_id = 0 ) {
3167      if ( ! EMPTY_TRASH_DAYS ) {
3168          return wp_delete_post( $post_id, true );
3169      }
3170  
3171      $post = get_post( $post_id );
3172  
3173      if ( ! $post ) {
3174          return $post;
3175      }
3176  
3177      if ( 'trash' === $post->post_status ) {
3178          return false;
3179      }
3180  
3181      /**
3182       * Filters whether a post trashing should take place.
3183       *
3184       * @since 4.9.0
3185       *
3186       * @param bool|null $trash Whether to go forward with trashing.
3187       * @param WP_Post   $post  Post object.
3188       */
3189      $check = apply_filters( 'pre_trash_post', null, $post );
3190      if ( null !== $check ) {
3191          return $check;
3192      }
3193  
3194      /**
3195       * Fires before a post is sent to the Trash.
3196       *
3197       * @since 3.3.0
3198       *
3199       * @param int $post_id Post ID.
3200       */
3201      do_action( 'wp_trash_post', $post_id );
3202  
3203      add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status );
3204      add_post_meta( $post_id, '_wp_trash_meta_time', time() );
3205  
3206      $post_updated = wp_update_post(
3207          array(
3208              'ID'          => $post_id,
3209              'post_status' => 'trash',
3210          )
3211      );
3212  
3213      if ( ! $post_updated ) {
3214          return false;
3215      }
3216  
3217      wp_trash_post_comments( $post_id );
3218  
3219      /**
3220       * Fires after a post is sent to the Trash.
3221       *
3222       * @since 2.9.0
3223       *
3224       * @param int $post_id Post ID.
3225       */
3226      do_action( 'trashed_post', $post_id );
3227  
3228      return $post;
3229  }
3230  
3231  /**
3232   * Restore a post or page from the Trash.
3233   *
3234   * @since 2.9.0
3235   *
3236   * @param int $post_id Optional. Post ID. Default is ID of the global $post.
3237   * @return WP_Post|false|null Post data on success, false or null on failure.
3238   */
3239  function wp_untrash_post( $post_id = 0 ) {
3240      $post = get_post( $post_id );
3241  
3242      if ( ! $post ) {
3243          return $post;
3244      }
3245  
3246      if ( 'trash' !== $post->post_status ) {
3247          return false;
3248      }
3249  
3250      /**
3251       * Filters whether a post untrashing should take place.
3252       *
3253       * @since 4.9.0
3254       *
3255       * @param bool|null $untrash Whether to go forward with untrashing.
3256       * @param WP_Post   $post    Post object.
3257       */
3258      $check = apply_filters( 'pre_untrash_post', null, $post );
3259      if ( null !== $check ) {
3260          return $check;
3261      }
3262  
3263      /**
3264       * Fires before a post is restored from the Trash.
3265       *
3266       * @since 2.9.0
3267       *
3268       * @param int $post_id Post ID.
3269       */
3270      do_action( 'untrash_post', $post_id );
3271  
3272      $post_status = get_post_meta( $post_id, '_wp_trash_meta_status', true );
3273  
3274      delete_post_meta( $post_id, '_wp_trash_meta_status' );
3275      delete_post_meta( $post_id, '_wp_trash_meta_time' );
3276  
3277      $post_updated = wp_update_post(
3278          array(
3279              'ID'          => $post_id,
3280              'post_status' => $post_status,
3281          )
3282      );
3283  
3284      if ( ! $post_updated ) {
3285          return false;
3286      }
3287  
3288      wp_untrash_post_comments( $post_id );
3289  
3290      /**
3291       * Fires after a post is restored from the Trash.
3292       *
3293       * @since 2.9.0
3294       *
3295       * @param int $post_id Post ID.
3296       */
3297      do_action( 'untrashed_post', $post_id );
3298  
3299      return $post;
3300  }
3301  
3302  /**
3303   * Moves comments for a post to the Trash.
3304   *
3305   * @since 2.9.0
3306   *
3307   * @global wpdb $wpdb WordPress database abstraction object.
3308   *
3309   * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
3310   * @return mixed|void False on failure.
3311   */
3312  function wp_trash_post_comments( $post = null ) {
3313      global $wpdb;
3314  
3315      $post = get_post( $post );
3316      if ( empty( $post ) ) {
3317          return;
3318      }
3319  
3320      $post_id = $post->ID;
3321  
3322      /**
3323       * Fires before comments are sent to the Trash.
3324       *
3325       * @since 2.9.0
3326       *
3327       * @param int $post_id Post ID.
3328       */
3329      do_action( 'trash_post_comments', $post_id );
3330  
3331      $comments = $wpdb->get_results( $wpdb->prepare( "SELECT comment_ID, comment_approved FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ) );
3332      if ( empty( $comments ) ) {
3333          return;
3334      }
3335  
3336      // Cache current status for each comment.
3337      $statuses = array();
3338      foreach ( $comments as $comment ) {
3339          $statuses[ $comment->comment_ID ] = $comment->comment_approved;
3340      }
3341      add_post_meta( $post_id, '_wp_trash_meta_comments_status', $statuses );
3342  
3343      // Set status for all comments to post-trashed.
3344      $result = $wpdb->update( $wpdb->comments, array( 'comment_approved' => 'post-trashed' ), array( 'comment_post_ID' => $post_id ) );
3345  
3346      clean_comment_cache( array_keys( $statuses ) );
3347  
3348      /**
3349       * Fires after comments are sent to the Trash.
3350       *
3351       * @since 2.9.0
3352       *
3353       * @param int   $post_id  Post ID.
3354       * @param array $statuses Array of comment statuses.
3355       */
3356      do_action( 'trashed_post_comments', $post_id, $statuses );
3357  
3358      return $result;
3359  }
3360  
3361  /**
3362   * Restore comments for a post from the Trash.
3363   *
3364   * @since 2.9.0
3365   *
3366   * @global wpdb $wpdb WordPress database abstraction object.
3367   *
3368   * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
3369   * @return true|void
3370   */
3371  function wp_untrash_post_comments( $post = null ) {
3372      global $wpdb;
3373  
3374      $post = get_post( $post );
3375      if ( empty( $post ) ) {
3376          return;
3377      }
3378  
3379      $post_id = $post->ID;
3380  
3381      $statuses = get_post_meta( $post_id, '_wp_trash_meta_comments_status', true );
3382  
3383      if ( empty( $statuses ) ) {
3384          return true;
3385      }
3386  
3387      /**
3388       * Fires before comments are restored for a post from the Trash.
3389       *
3390       * @since 2.9.0
3391       *
3392       * @param int $post_id Post ID.
3393       */
3394      do_action( 'untrash_post_comments', $post_id );
3395  
3396      // Restore each comment to its original status.
3397      $group_by_status = array();
3398      foreach ( $statuses as $comment_id => $comment_status ) {
3399          $group_by_status[ $comment_status ][] = $comment_id;
3400      }
3401  
3402      foreach ( $group_by_status as $status => $comments ) {
3403          // Sanity check. This shouldn't happen.
3404          if ( 'post-trashed' === $status ) {
3405              $status = '0';
3406          }
3407          $comments_in = implode( ', ', array_map( 'intval', $comments ) );
3408          $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->comments SET comment_approved = %s WHERE comment_ID IN ($comments_in)", $status ) );
3409      }
3410  
3411      clean_comment_cache( array_keys( $statuses ) );
3412  
3413      delete_post_meta( $post_id, '_wp_trash_meta_comments_status' );
3414  
3415      /**
3416       * Fires after comments are restored for a post from the Trash.
3417       *
3418       * @since 2.9.0
3419       *
3420       * @param int $post_id Post ID.
3421       */
3422      do_action( 'untrashed_post_comments', $post_id );
3423  }
3424  
3425  /**
3426   * Retrieve the list of categories for a post.
3427   *
3428   * Compatibility layer for themes and plugins. Also an easy layer of abstraction
3429   * away from the complexity of the taxonomy layer.
3430   *
3431   * @since 2.1.0
3432   *
3433   * @see wp_get_object_terms()
3434   *
3435   * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
3436   *                       global $post. Default 0.
3437   * @param array $args    Optional. Category query parameters. Default empty array.
3438   *                       See WP_Term_Query::__construct() for supported arguments.
3439   * @return array|WP_Error List of categories. If the `$fields` argument passed via `$args` is 'all' or
3440   *                        'all_with_object_id', an array of WP_Term objects will be returned. If `$fields`
3441   *                        is 'ids', an array of category IDs. If `$fields` is 'names', an array of category names.
3442   *                        WP_Error object if 'category' taxonomy doesn't exist.
3443   */
3444  function wp_get_post_categories( $post_id = 0, $args = array() ) {
3445      $post_id = (int) $post_id;
3446  
3447      $defaults = array( 'fields' => 'ids' );
3448      $args     = wp_parse_args( $args, $defaults );
3449  
3450      $cats = wp_get_object_terms( $post_id, 'category', $args );
3451      return $cats;
3452  }
3453  
3454  /**
3455   * Retrieve the tags for a post.
3456   *
3457   * There is only one default for this function, called 'fields' and by default
3458   * is set to 'all'. There are other defaults that can be overridden in
3459   * wp_get_object_terms().
3460   *
3461   * @since 2.3.0
3462   *
3463   * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
3464   *                       global $post. Default 0.
3465   * @param array $args    Optional. Tag query parameters. Default empty array.
3466   *                       See WP_Term_Query::__construct() for supported arguments.
3467   * @return array|WP_Error Array of WP_Term objects on success or empty array if no tags were found.
3468   *                        WP_Error object if 'post_tag' taxonomy doesn't exist.
3469   */
3470  function wp_get_post_tags( $post_id = 0, $args = array() ) {
3471      return wp_get_post_terms( $post_id, 'post_tag', $args );
3472  }
3473  
3474  /**
3475   * Retrieves the terms for a post.
3476   *
3477   * @since 2.8.0
3478   *
3479   * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the
3480   *                               global $post. Default 0.
3481   * @param string|array $taxonomy Optional. The taxonomy slug or array of slugs for which
3482   *                               to retrieve terms. Default 'post_tag'.
3483   * @param array        $args     {
3484   *     Optional. Term query parameters. See WP_Term_Query::__construct() for supported arguments.
3485   *
3486   *     @type string $fields Term fields to retrieve. Default 'all'.
3487   * }
3488   * @return array|WP_Error Array of WP_Term objects on success or empty array if no terms were found.
3489   *                        WP_Error object if `$taxonomy` doesn't exist.
3490   */
3491  function wp_get_post_terms( $post_id = 0, $taxonomy = 'post_tag', $args = array() ) {
3492      $post_id = (int) $post_id;
3493  
3494      $defaults = array( 'fields' => 'all' );
3495      $args     = wp_parse_args( $args, $defaults );
3496  
3497      $tags = wp_get_object_terms( $post_id, $taxonomy, $args );
3498  
3499      return $tags;
3500  }
3501  
3502  /**
3503   * Retrieve a number of recent posts.
3504   *
3505   * @since 1.0.0
3506   *
3507   * @see get_posts()
3508   *
3509   * @param array  $args   Optional. Arguments to retrieve posts. Default empty array.
3510   * @param string $output Optional. The required return type. One of OBJECT or ARRAY_A, which
3511   *                       correspond to a WP_Post object or an associative array, respectively.
3512   *                       Default ARRAY_A.
3513   * @return array|false Array of recent posts, where the type of each element is determined
3514   *                     by the `$output` parameter. Empty array on failure.
3515   */
3516  function wp_get_recent_posts( $args = array(), $output = ARRAY_A ) {
3517  
3518      if ( is_numeric( $args ) ) {
3519          _deprecated_argument( __FUNCTION__, '3.1.0', __( 'Passing an integer number of posts is deprecated. Pass an array of arguments instead.' ) );
3520          $args = array( 'numberposts' => absint( $args ) );
3521      }
3522  
3523      // Set default arguments.
3524      $defaults = array(
3525          'numberposts'      => 10,
3526          'offset'           => 0,
3527          'category'         => 0,
3528          'orderby'          => 'post_date',
3529          'order'            => 'DESC',
3530          'include'          => '',
3531          'exclude'          => '',
3532          'meta_key'         => '',
3533          'meta_value'       => '',
3534          'post_type'        => 'post',
3535          'post_status'      => 'draft, publish, future, pending, private',
3536          'suppress_filters' => true,
3537      );
3538  
3539      $parsed_args = wp_parse_args( $args, $defaults );
3540  
3541      $results = get_posts( $parsed_args );
3542  
3543      // Backward compatibility. Prior to 3.1 expected posts to be returned in array.
3544      if ( ARRAY_A == $output ) {
3545          foreach ( $results as $key => $result ) {
3546              $results[ $key ] = get_object_vars( $result );
3547          }
3548          return $results ? $results : array();
3549      }
3550  
3551      return $results ? $results : false;
3552  
3553  }
3554  
3555  /**
3556   * Insert or update a post.
3557   *
3558   * If the $postarr parameter has 'ID' set to a value, then post will be updated.
3559   *
3560   * You can set the post date manually, by setting the values for 'post_date'
3561   * and 'post_date_gmt' keys. You can close the comments or open the comments by
3562   * setting the value for 'comment_status' key.
3563   *
3564   * @since 1.0.0
3565   * @since 4.2.0 Support was added for encoding emoji in the post title, content, and excerpt.
3566   * @since 4.4.0 A 'meta_input' array can now be passed to `$postarr` to add post meta data.
3567   *
3568   * @see sanitize_post()
3569   * @global wpdb $wpdb WordPress database abstraction object.
3570   *
3571   * @param array $postarr {
3572   *     An array of elements that make up a post to update or insert.
3573   *
3574   *     @type int    $ID                    The post ID. If equal to something other than 0,
3575   *                                         the post with that ID will be updated. Default 0.
3576   *     @type int    $post_author           The ID of the user who added the post. Default is
3577   *                                         the current user ID.
3578   *     @type string $post_date             The date of the post. Default is the current time.
3579   *     @type string $post_date_gmt         The date of the post in the GMT timezone. Default is
3580   *                                         the value of `$post_date`.
3581   *     @type mixed  $post_content          The post content. Default empty.
3582   *     @type string $post_content_filtered The filtered post content. Default empty.
3583   *     @type string $post_title            The post title. Default empty.
3584   *     @type string $post_excerpt          The post excerpt. Default empty.
3585   *     @type string $post_status           The post status. Default 'draft'.
3586   *     @type string $post_type             The post type. Default 'post'.
3587   *     @type string $comment_status        Whether the post can accept comments. Accepts 'open' or 'closed'.
3588   *                                         Default is the value of 'default_comment_status' option.
3589   *     @type string $ping_status           Whether the post can accept pings. Accepts 'open' or 'closed'.
3590   *                                         Default is the value of 'default_ping_status' option.
3591   *     @type string $post_password         The password to access the post. Default empty.
3592   *     @type string $post_name             The post name. Default is the sanitized post title
3593   *                                         when creating a new post.
3594   *     @type string $to_ping               Space or carriage return-separated list of URLs to ping.
3595   *                                         Default empty.
3596   *     @type string $pinged                Space or carriage return-separated list of URLs that have
3597   *                                         been pinged. Default empty.
3598   *     @type string $post_modified         The date when the post was last modified. Default is
3599   *                                         the current time.
3600   *     @type string $post_modified_gmt     The date when the post was last modified in the GMT
3601   *                                         timezone. Default is the current time.
3602   *     @type int    $post_parent           Set this for the post it belongs to, if any. Default 0.
3603   *     @type int    $menu_order            The order the post should be displayed in. Default 0.
3604   *     @type string $post_mime_type        The mime type of the post. Default empty.
3605   *     @type string $guid                  Global Unique ID for referencing the post. Default empty.
3606   *     @type array  $post_category         Array of category IDs.
3607   *                                         Defaults to value of the 'default_category' option.
3608   *     @type array  $tags_input            Array of tag names, slugs, or IDs. Default empty.
3609   *     @type array  $tax_input             Array of taxonomy terms keyed by their taxonomy name. Default empty.
3610   *     @type array  $meta_input            Array of post meta values keyed by their post meta key. Default empty.
3611   * }
3612   * @param bool  $wp_error Optional. Whether to return a WP_Error on failure. Default false.
3613   * @return int|WP_Error The post ID on success. The value 0 or WP_Error on failure.
3614   */
3615  function wp_insert_post( $postarr, $wp_error = false ) {
3616      global $wpdb;
3617  
3618      // Capture original pre-sanitized array for passing into filters.
3619      $unsanitized_postarr = $postarr;
3620  
3621      $user_id = get_current_user_id();
3622  
3623      $defaults = array(
3624          'post_author'           => $user_id,
3625          'post_content'          => '',
3626          'post_content_filtered' => '',
3627          'post_title'            => '',
3628          'post_excerpt'          => '',
3629          'post_status'           => 'draft',
3630          'post_type'             => 'post',
3631          'comment_status'        => '',
3632          'ping_status'           => '',
3633          'post_password'         => '',
3634          'to_ping'               => '',
3635          'pinged'                => '',
3636          'post_parent'           => 0,
3637          'menu_order'            => 0,
3638          'guid'                  => '',
3639          'import_id'             => 0,
3640          'context'               => '',
3641      );
3642  
3643      $postarr = wp_parse_args( $postarr, $defaults );
3644  
3645      unset( $postarr['filter'] );
3646  
3647      $postarr = sanitize_post( $postarr, 'db' );
3648  
3649      // Are we updating or creating?
3650      $post_ID = 0;
3651      $update  = false;
3652      $guid    = $postarr['guid'];
3653  
3654      if ( ! empty( $postarr['ID'] ) ) {
3655          $update = true;
3656  
3657          // Get the post ID and GUID.
3658          $post_ID     = $postarr['ID'];
3659          $post_before = get_post( $post_ID );
3660  
3661          if ( is_null( $post_before ) ) {
3662              if ( $wp_error ) {
3663                  return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
3664              }
3665              return 0;
3666          }
3667  
3668          $guid            = get_post_field( 'guid', $post_ID );
3669          $previous_status = get_post_field( 'post_status', $post_ID );
3670      } else {
3671          $previous_status = 'new';
3672      }
3673  
3674      $post_type = empty( $postarr['post_type'] ) ? 'post' : $postarr['post_type'];
3675  
3676      $post_title   = $postarr['post_title'];
3677      $post_content = $postarr['post_content'];
3678      $post_excerpt = $postarr['post_excerpt'];
3679  
3680      if ( isset( $postarr['post_name'] ) ) {
3681          $post_name = $postarr['post_name'];
3682      } elseif ( $update ) {
3683          // For an update, don't modify the post_name if it wasn't supplied as an argument.
3684          $post_name = $post_before->post_name;
3685      }
3686  
3687      $maybe_empty = 'attachment' !== $post_type
3688          && ! $post_content && ! $post_title && ! $post_excerpt
3689          && post_type_supports( $post_type, 'editor' )
3690          && post_type_supports( $post_type, 'title' )
3691          && post_type_supports( $post_type, 'excerpt' );
3692  
3693      /**
3694       * Filters whether the post should be considered "empty".
3695       *
3696       * The post is considered "empty" if both:
3697       * 1. The post type supports the title, editor, and excerpt fields
3698       * 2. The title, editor, and excerpt fields are all empty
3699       *
3700       * Returning a truthy value from the filter will effectively short-circuit
3701       * the new post being inserted and return 0. If $wp_error is true, a WP_Error
3702       * will be returned instead.
3703       *
3704       * @since 3.3.0
3705       *
3706       * @param bool  $maybe_empty Whether the post should be considered "empty".
3707       * @param array $postarr     Array of post data.
3708       */
3709      if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) {
3710          if ( $wp_error ) {
3711              return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) );
3712          } else {
3713              return 0;
3714          }
3715      }
3716  
3717      $post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status'];
3718  
3719      if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash', 'auto-draft' ), true ) ) {
3720          $post_status = 'inherit';
3721      }
3722  
3723      if ( ! empty( $postarr['post_category'] ) ) {
3724          // Filter out empty terms.
3725          $post_category = array_filter( $postarr['post_category'] );
3726      }
3727  
3728      // Make sure we set a valid category.
3729      if ( empty( $post_category ) || 0 === count( $post_category ) || ! is_array( $post_category ) ) {
3730          // 'post' requires at least one category.
3731          if ( 'post' === $post_type && 'auto-draft' !== $post_status ) {
3732              $post_category = array( get_option( 'default_category' ) );
3733          } else {
3734              $post_category = array();
3735          }
3736      }
3737  
3738      /*
3739       * Don't allow contributors to set the post slug for pending review posts.
3740       *
3741       * For new posts check the primitive capability, for updates check the meta capability.
3742       */
3743      $post_type_object = get_post_type_object( $post_type );
3744  
3745      if ( ! $update && 'pending' === $post_status && ! current_user_can( $post_type_object->cap->publish_posts ) ) {
3746          $post_name = '';
3747      } elseif ( $update && 'pending' === $post_status && ! current_user_can( 'publish_post', $post_ID ) ) {
3748          $post_name = '';
3749      }
3750  
3751      /*
3752       * Create a valid post name. Drafts and pending posts are allowed to have
3753       * an empty post name.
3754       */
3755      if ( empty( $post_name ) ) {
3756          if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ), true ) ) {
3757              $post_name = sanitize_title( $post_title );
3758          } else {
3759              $post_name = '';
3760          }
3761      } else {
3762          // On updates, we need to check to see if it's using the old, fixed sanitization context.
3763          $check_name = sanitize_title( $post_name, '', 'old-save' );
3764  
3765          if ( $update && strtolower( urlencode( $post_name ) ) == $check_name && get_post_field( 'post_name', $post_ID ) == $check_name ) {
3766              $post_name = $check_name;
3767          } else { // new post, or slug has changed.
3768              $post_name = sanitize_title( $post_name );
3769          }
3770      }
3771  
3772      /*
3773       * If the post date is empty (due to having been new or a draft) and status
3774       * is not 'draft' or 'pending', set date to now.
3775       */
3776      if ( empty( $postarr['post_date'] ) || '0000-00-00 00:00:00' === $postarr['post_date'] ) {
3777          if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' === $postarr['post_date_gmt'] ) {
3778              $post_date = current_time( 'mysql' );
3779          } else {
3780              $post_date = get_date_from_gmt( $postarr['post_date_gmt'] );
3781          }
3782      } else {
3783          $post_date = $postarr['post_date'];
3784      }
3785  
3786      // Validate the date.
3787      $mm         = substr( $post_date, 5, 2 );
3788      $jj         = substr( $post_date, 8, 2 );
3789      $aa         = substr( $post_date, 0, 4 );
3790      $valid_date = wp_checkdate( $mm, $jj, $aa, $post_date );
3791      if ( ! $valid_date ) {
3792          if ( $wp_error ) {
3793              return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
3794          } else {
3795              return 0;
3796          }
3797      }
3798  
3799      if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' === $postarr['post_date_gmt'] ) {
3800          if ( ! in_array( $post_status, get_post_stati( array( 'date_floating' => true ) ), true ) ) {
3801              $post_date_gmt = get_gmt_from_date( $post_date );
3802          } else {
3803              $post_date_gmt = '0000-00-00 00:00:00';
3804          }
3805      } else {
3806          $post_date_gmt = $postarr['post_date_gmt'];
3807      }
3808  
3809      if ( $update || '0000-00-00 00:00:00' === $post_date ) {
3810          $post_modified     = current_time( 'mysql' );
3811          $post_modified_gmt = current_time( 'mysql', 1 );
3812      } else {
3813          $post_modified     = $post_date;
3814          $post_modified_gmt = $post_date_gmt;
3815      }
3816  
3817      if ( 'attachment' !== $post_type ) {
3818          $now = gmdate( 'Y-m-d H:i:s' );
3819  
3820          if ( 'publish' === $post_status ) {
3821              if ( strtotime( $post_date_gmt ) - strtotime( $now ) >= MINUTE_IN_SECONDS ) {
3822                  $post_status = 'future';
3823              }
3824          } elseif ( 'future' === $post_status ) {
3825              if ( strtotime( $post_date_gmt ) - strtotime( $now ) < MINUTE_IN_SECONDS ) {
3826                  $post_status = 'publish';
3827              }
3828          }
3829      }
3830  
3831      // Comment status.
3832      if ( empty( $postarr['comment_status'] ) ) {
3833          if ( $update ) {
3834              $comment_status = 'closed';
3835          } else {
3836              $comment_status = get_default_comment_status( $post_type );
3837          }
3838      } else {
3839          $comment_status = $postarr['comment_status'];
3840      }
3841  
3842      // These variables are needed by compact() later.
3843      $post_content_filtered = $postarr['post_content_filtered'];
3844      $post_author           = isset( $postarr['post_author'] ) ? $postarr['post_author'] : $user_id;
3845      $ping_status           = empty( $postarr['ping_status'] ) ? get_default_comment_status( $post_type, 'pingback' ) : $postarr['ping_status'];
3846      $to_ping               = isset( $postarr['to_ping'] ) ? sanitize_trackback_urls( $postarr['to_ping'] ) : '';
3847      $pinged                = isset( $postarr['pinged'] ) ? $postarr['pinged'] : '';
3848      $import_id             = isset( $postarr['import_id'] ) ? $postarr['import_id'] : 0;
3849  
3850      /*
3851       * The 'wp_insert_post_parent' filter expects all variables to be present.
3852       * Previously, these variables would have already been extracted
3853       */
3854      if ( isset( $postarr['menu_order'] ) ) {
3855          $menu_order = (int) $postarr['menu_order'];
3856      } else {
3857          $menu_order = 0;
3858      }
3859  
3860      $post_password = isset( $postarr['post_password'] ) ? $postarr['post_password'] : '';
3861      if ( 'private' === $post_status ) {
3862          $post_password = '';
3863      }
3864  
3865      if ( isset( $postarr['post_parent'] ) ) {
3866          $post_parent = (int) $postarr['post_parent'];
3867      } else {
3868          $post_parent = 0;
3869      }
3870  
3871      $new_postarr = array_merge(
3872          array(
3873              'ID' => $post_ID,
3874          ),
3875          compact( array_diff( array_keys( $defaults ), array( 'context', 'filter' ) ) )
3876      );
3877  
3878      /**
3879       * Filters the post parent -- used to check for and prevent hierarchy loops.
3880       *
3881       * @since 3.1.0
3882       *
3883       * @param int   $post_parent Post parent ID.
3884       * @param int   $post_ID     Post ID.
3885       * @param array $new_postarr Array of parsed post data.
3886       * @param array $postarr     Array of sanitized, but otherwise unmodified post data.
3887       */
3888      $post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, $new_postarr, $postarr );
3889  
3890      /*
3891       * If the post is being untrashed and it has a desired slug stored in post meta,
3892       * reassign it.
3893       */
3894      if ( 'trash' === $previous_status && 'trash' !== $post_status ) {
3895          $desired_post_slug = get_post_meta( $post_ID, '_wp_desired_post_slug', true );
3896  
3897          if ( $desired_post_slug ) {
3898              delete_post_meta( $post_ID, '_wp_desired_post_slug' );
3899              $post_name = $desired_post_slug;
3900          }
3901      }
3902  
3903      // If a trashed post has the desired slug, change it and let this post have it.
3904      if ( 'trash' !== $post_status && $post_name ) {
3905          /**
3906           * Filters whether or not to add a `__trashed` suffix to trashed posts that match the name of the updated post.
3907           *
3908           * @since 5.4.0
3909           *
3910           * @param bool   $add_trashed_suffix Whether to attempt to add the suffix.
3911           * @param string $post_name          The name of the post being updated.
3912           * @param int    $post_ID            Post ID.
3913           */
3914          $add_trashed_suffix = apply_filters( 'add_trashed_suffix_to_trashed_posts', true, $post_name, $post_ID );
3915  
3916          if ( $add_trashed_suffix ) {
3917              wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID );
3918          }
3919      }
3920  
3921      // When trashing an existing post, change its slug to allow non-trashed posts to use it.
3922      if ( 'trash' === $post_status && 'trash' !== $previous_status && 'new' !== $previous_status ) {
3923          $post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_ID );
3924      }
3925  
3926      $post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent );
3927  
3928      // Don't unslash.
3929      $post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';
3930  
3931      // Expected_slashed (everything!).
3932      $data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' );
3933  
3934      $emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );
3935  
3936      foreach ( $emoji_fields as $emoji_field ) {
3937          if ( isset( $data[ $emoji_field ] ) ) {
3938              $charset = $wpdb->get_col_charset( $wpdb->posts, $emoji_field );
3939  
3940              if ( 'utf8' === $charset ) {
3941                  $data[ $emoji_field ] = wp_encode_emoji( $data[ $emoji_field ] );
3942              }
3943          }
3944      }
3945  
3946      if ( 'attachment' === $post_type ) {
3947          /**
3948           * Filters attachment post data before it is updated in or added to the database.
3949           *
3950           * @since 3.9.0
3951           * @since 5.4.1 `$unsanitized_postarr` argument added.
3952           *
3953           * @param array $data                An array of slashed, sanitized, and processed attachment post data.
3954           * @param array $postarr             An array of slashed and sanitized attachment post data, but not processed.
3955           * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed attachment post data
3956           *                                   as originally passed to wp_insert_post().
3957           */
3958          $data = apply_filters( 'wp_insert_attachment_data', $data, $postarr, $unsanitized_postarr );
3959      } else {
3960          /**
3961           * Filters slashed post data just before it is inserted into the database.
3962           *
3963           * @since 2.7.0
3964           * @since 5.4.1 `$unsanitized_postarr` argument added.
3965           *
3966           * @param array $data                An array of slashed, sanitized, and processed post data.
3967           * @param array $postarr             An array of sanitized (and slashed) but otherwise unmodified post data.
3968           * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as
3969           *                                   originally passed to wp_insert_post().
3970           */
3971          $data = apply_filters( 'wp_insert_post_data', $data, $postarr, $unsanitized_postarr );
3972      }
3973  
3974      $data  = wp_unslash( $data );
3975      $where = array( 'ID' => $post_ID );
3976  
3977      if ( $update ) {
3978          /**
3979           * Fires immediately before an existing post is updated in the database.
3980           *
3981           * @since 2.5.0
3982           *
3983           * @param int   $post_ID Post ID.
3984           * @param array $data    Array of unslashed post data.
3985           */
3986          do_action( 'pre_post_update', $post_ID, $data );
3987  
3988          if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
3989              if ( $wp_error ) {
3990                  if ( 'attachment' === $post_type ) {
3991                      $message = __( 'Could not update attachment in the database.' );
3992                  } else {
3993                      $message = __( 'Could not update post in the database.' );
3994                  }
3995  
3996                  return new WP_Error( 'db_update_error', $message, $wpdb->last_error );
3997              } else {
3998                  return 0;
3999              }
4000          }
4001      } else {
4002          // If there is a suggested ID, use it if not already present.
4003          if ( ! empty( $import_id ) ) {
4004              $import_id = (int) $import_id;
4005  
4006              if ( ! $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id ) ) ) {
4007                  $data['ID'] = $import_id;
4008              }
4009          }
4010  
4011          if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
4012              if ( $wp_error ) {
4013                  if ( 'attachment' === $post_type ) {
4014                      $message = __( 'Could not insert attachment into the database.' );
4015                  } else {
4016                      $message = __( 'Could not insert post into the database.' );
4017                  }
4018  
4019                  return new WP_Error( 'db_insert_error', $message, $wpdb->last_error );
4020              } else {
4021                  return 0;
4022              }
4023          }
4024  
4025          $post_ID = (int) $wpdb->insert_id;
4026  
4027          // Use the newly generated $post_ID.
4028          $where = array( 'ID' => $post_ID );
4029      }
4030  
4031      if ( empty( $data['post_name'] ) && ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ), true ) ) {
4032          $data['post_name'] = wp_unique_post_slug( sanitize_title( $data['post_title'], $post_ID ), $post_ID, $data['post_status'], $post_type, $post_parent );
4033  
4034          $wpdb->update( $wpdb->posts, array( 'post_name' => $data['post_name'] ), $where );
4035          clean_post_cache( $post_ID );
4036      }
4037  
4038      if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
4039          wp_set_post_categories( $post_ID, $post_category );
4040      }
4041  
4042      if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $post_type, 'post_tag' ) ) {
4043          wp_set_post_tags( $post_ID, $postarr['tags_input'] );
4044      }
4045  
4046      // Add default term for all associated custom taxonomies.
4047      if ( 'auto-draft' !== $post_status ) {
4048          foreach ( get_object_taxonomies( $post_type, 'object' ) as $taxonomy => $tax_object ) {
4049  
4050              if ( ! empty( $tax_object->default_term ) ) {
4051  
4052                  // Filter out empty terms.
4053                  if ( isset( $postarr['tax_input'] ) && is_array( $postarr['tax_input'][ $taxonomy ] ) ) {
4054                      $postarr['tax_input'][ $taxonomy ] = array_filter( $postarr['tax_input'][ $taxonomy ] );
4055                  }
4056  
4057                  // Passed custom taxonomy list overwrites the existing list if not empty.
4058                  $terms = wp_get_object_terms( $post_ID, $taxonomy, array( 'fields' => 'ids' ) );
4059                  if ( ! empty( $terms ) && empty( $postarr['tax_input'][ $taxonomy ] ) ) {
4060                      $postarr['tax_input'][ $taxonomy ] = $terms;
4061                  }
4062  
4063                  if ( empty( $postarr['tax_input'][ $taxonomy ] ) ) {
4064                      $default_term_id = get_option( 'default_term_' . $taxonomy );
4065                      if ( ! empty( $default_term_id ) ) {
4066                          $postarr['tax_input'][ $taxonomy ] = array( (int) $default_term_id );
4067                      }
4068                  }
4069              }
4070          }
4071      }
4072  
4073      // New-style support for all custom taxonomies.
4074      if ( ! empty( $postarr['tax_input'] ) ) {
4075          foreach ( $postarr['tax_input'] as $taxonomy => $tags ) {
4076              $taxonomy_obj = get_taxonomy( $taxonomy );
4077  
4078              if ( ! $taxonomy_obj ) {
4079                  /* translators: %s: Taxonomy name. */
4080                  _doing_it_wrong( __FUNCTION__, sprintf( __( 'Invalid taxonomy: %s.' ), $taxonomy ), '4.4.0' );
4081                  continue;
4082              }
4083  
4084              // array = hierarchical, string = non-hierarchical.
4085              if ( is_array( $tags ) ) {
4086                  $tags = array_filter( $tags );
4087              }
4088  
4089              if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
4090                  wp_set_post_terms( $post_ID, $tags, $taxonomy );
4091              }
4092          }
4093      }
4094  
4095      if ( ! empty( $postarr['meta_input'] ) ) {
4096          foreach ( $postarr['meta_input'] as $field => $value ) {
4097              update_post_meta( $post_ID, $field, $value );
4098          }
4099      }
4100  
4101      $current_guid = get_post_field( 'guid', $post_ID );
4102  
4103      // Set GUID.
4104      if ( ! $update && '' === $current_guid ) {
4105          $wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
4106      }
4107  
4108      if ( 'attachment' === $postarr['post_type'] ) {
4109          if ( ! empty( $postarr['file'] ) ) {
4110              update_attached_file( $post_ID, $postarr['file'] );
4111          }
4112  
4113          if ( ! empty( $postarr['context'] ) ) {
4114              add_post_meta( $post_ID, '_wp_attachment_context', $postarr['context'], true );
4115          }
4116      }
4117  
4118      // Set or remove featured image.
4119      if ( isset( $postarr['_thumbnail_id'] ) ) {
4120          $thumbnail_support = current_theme_supports( 'post-thumbnails', $post_type ) && post_type_supports( $post_type, 'thumbnail' ) || 'revision' === $post_type;
4121  
4122          if ( ! $thumbnail_support && 'attachment' === $post_type && $post_mime_type ) {
4123              if ( wp_attachment_is( 'audio', $post_ID ) ) {
4124                  $thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
4125              } elseif ( wp_attachment_is( 'video', $post_ID ) ) {
4126                  $thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
4127              }
4128          }
4129  
4130          if ( $thumbnail_support ) {
4131              $thumbnail_id = intval( $postarr['_thumbnail_id'] );
4132              if ( -1 === $thumbnail_id ) {
4133                  delete_post_thumbnail( $post_ID );
4134              } else {
4135                  set_post_thumbnail( $post_ID, $thumbnail_id );
4136              }
4137          }
4138      }
4139  
4140      clean_post_cache( $post_ID );
4141  
4142      $post = get_post( $post_ID );
4143  
4144      if ( ! empty( $postarr['page_template'] ) ) {
4145          $post->page_template = $postarr['page_template'];
4146          $page_templates      = wp_get_theme()->get_page_templates( $post );
4147  
4148          if ( 'default' !== $postarr['page_template'] && ! isset( $page_templates[ $postarr['page_template'] ] ) ) {
4149              if ( $wp_error ) {
4150                  return new WP_Error( 'invalid_page_template', __( 'Invalid page template.' ) );
4151              }
4152  
4153              update_post_meta( $post_ID, '_wp_page_template', 'default' );
4154          } else {
4155              update_post_meta( $post_ID, '_wp_page_template', $postarr['page_template'] );
4156          }
4157      }
4158  
4159      if ( 'attachment' !== $postarr['post_type'] ) {
4160          wp_transition_post_status( $data['post_status'], $previous_status, $post );
4161      } else {
4162          if ( $update ) {
4163              /**
4164               * Fires once an existing attachment has been updated.
4165               *
4166               * @since 2.0.0
4167               *
4168               * @param int $post_ID Attachment ID.
4169               */
4170              do_action( 'edit_attachment', $post_ID );
4171  
4172              $post_after = get_post( $post_ID );
4173  
4174              /**
4175               * Fires once an existing attachment has been updated.
4176               *
4177               * @since 4.4.0
4178               *
4179               * @param int     $post_ID      Post ID.
4180               * @param WP_Post $post_after   Post object following the update.
4181               * @param WP_Post $post_before  Post object before the update.
4182               */
4183              do_action( 'attachment_updated', $post_ID, $post_after, $post_before );
4184          } else {
4185  
4186              /**
4187               * Fires once an attachment has been added.
4188               *
4189               * @since 2.0.0
4190               *
4191               * @param int $post_ID Attachment ID.
4192               */
4193              do_action( 'add_attachment', $post_ID );
4194          }
4195  
4196          return $post_ID;
4197      }
4198  
4199      if ( $update ) {
4200          /**
4201           * Fires once an existing post has been updated.
4202           *
4203           * The dynamic portion of the hook name, `$post->post_type`, refers to
4204           * the post type slug.
4205           *
4206           * @since 5.1.0
4207           *
4208           * @param int     $post_ID Post ID.
4209           * @param WP_Post $post    Post object.
4210           */
4211          do_action( "edit_post_{$post->post_type}", $post_ID, $post );
4212  
4213          /**
4214           * Fires once an existing post has been updated.
4215           *
4216           * @since 1.2.0
4217           *
4218           * @param int     $post_ID Post ID.
4219           * @param WP_Post $post    Post object.
4220           */
4221          do_action( 'edit_post', $post_ID, $post );
4222  
4223          $post_after = get_post( $post_ID );
4224  
4225          /**
4226           * Fires once an existing post has been updated.
4227           *
4228           * @since 3.0.0
4229           *
4230           * @param int     $post_ID      Post ID.
4231           * @param WP_Post $post_after   Post object following the update.
4232           * @param WP_Post $post_before  Post object before the update.
4233           */
4234          do_action( 'post_updated', $post_ID, $post_after, $post_before );
4235      }
4236  
4237      /**
4238       * Fires once a post has been saved.
4239       *
4240       * The dynamic portion of the hook name, `$post->post_type`, refers to
4241       * the post type slug.
4242       *
4243       * @since 3.7.0
4244       *
4245       * @param int     $post_ID Post ID.
4246       * @param WP_Post $post    Post object.
4247       * @param bool    $update  Whether this is an existing post being updated.
4248       */
4249      do_action( "save_post_{$post->post_type}", $post_ID, $post, $update );
4250  
4251      /**
4252       * Fires once a post has been saved.
4253       *
4254       * @since 1.5.0
4255       *
4256       * @param int     $post_ID Post ID.
4257       * @param WP_Post $post    Post object.
4258       * @param bool    $update  Whether this is an existing post being updated.
4259       */
4260      do_action( 'save_post', $post_ID, $post, $update );
4261  
4262      /**
4263       * Fires once a post has been saved.
4264       *
4265       * @since 2.0.0
4266       *
4267       * @param int     $post_ID Post ID.
4268       * @param WP_Post $post    Post object.
4269       * @param bool    $update  Whether this is an existing post being updated.
4270       */
4271      do_action( 'wp_insert_post', $post_ID, $post, $update );
4272  
4273      return $post_ID;
4274  }
4275  
4276  /**
4277   * Update a post with new post data.
4278   *
4279   * The date does not have to be set for drafts. You can set the date and it will
4280   * not be overridden.
4281   *
4282   * @since 1.0.0
4283   *
4284   * @param array|object $postarr  Optional. Post data. Arrays are expected to be escaped,
4285   *                               objects are not. Default array.
4286   * @param bool         $wp_error Optional. Allow return of WP_Error on failure. Default false.
4287   * @return int|WP_Error The post ID on success. The value 0 or WP_Error on failure.
4288   */
4289  function wp_update_post( $postarr = array(), $wp_error = false ) {
4290      if ( is_object( $postarr ) ) {
4291          // Non-escaped post was passed.
4292          $postarr = get_object_vars( $postarr );
4293          $postarr = wp_slash( $postarr );
4294      }
4295  
4296      // First, get all of the original fields.
4297      $post = get_post( $postarr['ID'], ARRAY_A );
4298  
4299      if ( is_null( $post ) ) {
4300          if ( $wp_error ) {
4301              return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
4302          }
4303          return 0;
4304      }
4305  
4306      // Escape data pulled from DB.
4307      $post = wp_slash( $post );
4308  
4309      // Passed post category list overwrites existing category list if not empty.
4310      if ( isset( $postarr['post_category'] ) && is_array( $postarr['post_category'] )
4311          && count( $postarr['post_category'] ) > 0
4312      ) {
4313          $post_cats = $postarr['post_category'];
4314      } else {
4315          $post_cats = $post['post_category'];
4316      }
4317  
4318      // Drafts shouldn't be assigned a date unless explicitly done so by the user.
4319      if ( isset( $post['post_status'] )
4320          && in_array( $post['post_status'], array( 'draft', 'pending', 'auto-draft' ), true )
4321          && empty( $postarr['edit_date'] ) && ( '0000-00-00 00:00:00' === $post['post_date_gmt'] )
4322      ) {
4323          $clear_date = true;
4324      } else {
4325          $clear_date = false;
4326      }
4327  
4328      // Merge old and new fields with new fields overwriting old ones.
4329      $postarr                  = array_merge( $post, $postarr );
4330      $postarr['post_category'] = $post_cats;
4331      if ( $clear_date ) {
4332          $postarr['post_date']     = current_time( 'mysql' );
4333          $postarr['post_date_gmt'] = '';
4334      }
4335  
4336      if ( 'attachment' === $postarr['post_type'] ) {
4337          return wp_insert_attachment( $postarr, false, 0, $wp_error );
4338      }
4339  
4340      // Discard 'tags_input' parameter if it's the same as existing post tags.
4341      if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $postarr['post_type'], 'post_tag' ) ) {
4342          $tags      = get_the_terms( $postarr['ID'], 'post_tag' );
4343          $tag_names = array();
4344  
4345          if ( $tags && ! is_wp_error( $tags ) ) {
4346              $tag_names = wp_list_pluck( $tags, 'name' );
4347          }
4348  
4349          if ( $postarr['tags_input'] === $tag_names ) {
4350              unset( $postarr['tags_input'] );
4351          }
4352      }
4353  
4354      return wp_insert_post( $postarr, $wp_error );
4355  }
4356  
4357  /**
4358   * Publish a post by transitioning the post status.
4359   *
4360   * @since 2.1.0
4361   *
4362   * @global wpdb $wpdb WordPress database abstraction object.
4363   *
4364   * @param int|WP_Post $post Post ID or post object.
4365   */
4366  function wp_publish_post( $post ) {
4367      global $wpdb;
4368  
4369      $post = get_post( $post );
4370      if ( ! $post ) {
4371          return;
4372      }
4373  
4374      if ( 'publish' === $post->post_status ) {
4375          return;
4376      }
4377  
4378      // Ensure at least one term is applied for taxonomies with a default term.
4379      foreach ( get_object_taxonomies( $post->post_type, 'object' ) as $taxonomy => $tax_object ) {
4380          // Skip taxonomy if no default term is set.
4381          if (
4382              'category' !== $taxonomy &&
4383              empty( $tax_object->default_term )
4384          ) {
4385              continue;
4386          }
4387  
4388          // Do not modify previously set terms.
4389          if ( ! empty( get_the_terms( $post, $taxonomy ) ) ) {
4390              continue;
4391          }
4392  
4393          if ( 'category' === $taxonomy ) {
4394              $default_term_id = (int) get_option( 'default_category', 0 );
4395          } else {
4396              $default_term_id = (int) get_option( 'default_term_' . $taxonomy, 0 );
4397          }
4398  
4399          if ( ! $default_term_id ) {
4400              continue;
4401          }
4402          wp_set_post_terms( $post->ID, array( $default_term_id ), $taxonomy );
4403      }
4404  
4405      $wpdb->update( $wpdb->posts, array( 'post_status' => 'publish' ), array( 'ID' => $post->ID ) );
4406  
4407      clean_post_cache( $post->ID );
4408  
4409      $old_status        = $post->post_status;
4410      $post->post_status = 'publish';
4411      wp_transition_post_status( 'publish', $old_status, $post );
4412  
4413      /** This action is documented in wp-includes/post.php */
4414      do_action( "edit_post_{$post->post_type}", $post->ID, $post );
4415  
4416      /** This action is documented in wp-includes/post.php */
4417      do_action( 'edit_post', $post->ID, $post );
4418  
4419      /** This action is documented in wp-includes/post.php */
4420      do_action( "save_post_{$post->post_type}", $post->ID, $post, true );
4421  
4422      /** This action is documented in wp-includes/post.php */
4423      do_action( 'save_post', $post->ID, $post, true );
4424  
4425      /** This action is documented in wp-includes/post.php */
4426      do_action( 'wp_insert_post', $post->ID, $post, true );
4427  }
4428  
4429  /**
4430   * Publish future post and make sure post ID has future post status.
4431   *
4432   * Invoked by cron 'publish_future_post' event. This safeguard prevents cron
4433   * from publishing drafts, etc.
4434   *
4435   * @since 2.5.0
4436   *
4437   * @param int|WP_Post $post_id Post ID or post object.
4438   */
4439  function check_and_publish_future_post( $post_id ) {
4440      $post = get_post( $post_id );
4441  
4442      if ( empty( $post ) ) {
4443          return;
4444      }
4445  
4446      if ( 'future' !== $post->post_status ) {
4447          return;
4448      }
4449  
4450      $time = strtotime( $post->post_date_gmt . ' GMT' );
4451  
4452      // Uh oh, someone jumped the gun!
4453      if ( $time > time() ) {
4454          wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // Clear anything else in the system.
4455          wp_schedule_single_event( $time, 'publish_future_post', array( $post_id ) );
4456          return;
4457      }
4458  
4459      // wp_publish_post() returns no meaningful value.
4460      wp_publish_post( $post_id );
4461  }
4462  
4463  /**
4464   * Computes a unique slug for the post, when given the desired slug and some post details.
4465   *
4466   * @since 2.8.0
4467   *
4468   * @global wpdb       $wpdb       WordPress database abstraction object.
4469   * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
4470   *
4471   * @param string $slug        The desired slug (post_name).
4472   * @param int    $post_ID     Post ID.
4473   * @param string $post_status No uniqueness checks are made if the post is still draft or pending.
4474   * @param string $post_type   Post type.
4475   * @param int    $post_parent Post parent ID.
4476   * @return string Unique slug for the post, based on $post_name (with a -1, -2, etc. suffix)
4477   */
4478  function wp_unique_post_slug( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
4479      if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ), true )
4480          || ( 'inherit' === $post_status && 'revision' === $post_type ) || 'user_request' === $post_type
4481      ) {
4482          return $slug;
4483      }
4484  
4485      /**
4486       * Filters the post slug before it is generated to be unique.
4487       *
4488       * Returning a non-null value will short-circuit the
4489       * unique slug generation, returning the passed value instead.
4490       *
4491       * @since 5.1.0
4492       *
4493       * @param string|null $override_slug Short-circuit return value.
4494       * @param string      $slug          The desired slug (post_name).
4495       * @param int         $post_ID       Post ID.
4496       * @param string      $post_status   The post status.
4497       * @param string      $post_type     Post type.
4498       * @param int         $post_parent   Post parent ID.
4499       */
4500      $override_slug = apply_filters( 'pre_wp_unique_post_slug', null, $slug, $post_ID, $post_status, $post_type, $post_parent );
4501      if ( null !== $override_slug ) {
4502          return $override_slug;
4503      }
4504  
4505      global $wpdb, $wp_rewrite;
4506  
4507      $original_slug = $slug;
4508  
4509      $feeds = $wp_rewrite->feeds;
4510      if ( ! is_array( $feeds ) ) {
4511          $feeds = array();
4512      }
4513  
4514      if ( 'attachment' === $post_type ) {
4515          // Attachment slugs must be unique across all types.
4516          $check_sql       = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
4517          $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );
4518  
4519          /**
4520           * Filters whether the post slug would make a bad attachment slug.
4521           *
4522           * @since 3.1.0
4523           *
4524           * @param bool   $bad_slug Whether the slug would be bad as an attachment slug.
4525           * @param string $slug     The post slug.
4526           */
4527          $is_bad_attachment_slug = apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug );
4528  
4529          if ( $post_name_check
4530              || in_array( $slug, $feeds, true ) || 'embed' === $slug
4531              || $is_bad_attachment_slug
4532          ) {
4533              $suffix = 2;
4534              do {
4535                  $alt_post_name   = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
4536                  $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
4537                  $suffix++;
4538              } while ( $post_name_check );
4539              $slug = $alt_post_name;
4540          }
4541      } elseif ( is_post_type_hierarchical( $post_type ) ) {
4542          if ( 'nav_menu_item' === $post_type ) {
4543              return $slug;
4544          }
4545  
4546          /*
4547           * Page slugs must be unique within their own trees. Pages are in a separate
4548           * namespace than posts so page slugs are allowed to overlap post slugs.
4549           */
4550          $check_sql       = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
4551          $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );
4552  
4553          /**
4554           * Filters whether the post slug would make a bad hierarchical post slug.
4555           *
4556           * @since 3.1.0
4557           *
4558           * @param bool   $bad_slug    Whether the post slug would be bad in a hierarchical post context.
4559           * @param string $slug        The post slug.
4560           * @param string $post_type   Post type.
4561           * @param int    $post_parent Post parent ID.
4562           */
4563          $is_bad_hierarchical_slug = apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent );
4564  
4565          if ( $post_name_check
4566              || in_array( $slug, $feeds, true ) || 'embed' === $slug
4567              || preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug )
4568              || $is_bad_hierarchical_slug
4569          ) {
4570              $suffix = 2;
4571              do {
4572                  $alt_post_name   = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
4573                  $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID, $post_parent ) );
4574                  $suffix++;
4575              } while ( $post_name_check );
4576              $slug = $alt_post_name;
4577          }
4578      } else {
4579          // Post slugs must be unique across all posts.
4580          $check_sql       = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
4581          $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );
4582  
4583          $post = get_post( $post_ID );
4584  
4585          // Prevent new post slugs that could result in URLs that conflict with date archives.
4586          $conflicts_with_date_archive = false;
4587          if ( 'post' === $post_type && ( ! $post || $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) ) {
4588              $slug_num = intval( $slug );
4589  
4590              if ( $slug_num ) {
4591                  $permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
4592                  $postname_index = array_search( '%postname%', $permastructs, true );
4593  
4594                  /*
4595                  * Potential date clashes are as follows:
4596                  *
4597                  * - Any integer in the first permastruct position could be a year.
4598                  * - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
4599                  * - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
4600                  */
4601                  if ( 0 === $postname_index ||
4602                      ( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) ||
4603                      ( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
4604                  ) {
4605                      $conflicts_with_date_archive = true;
4606                  }
4607              }
4608          }
4609  
4610          /**
4611           * Filters whether the post slug would be bad as a flat slug.
4612           *
4613           * @since 3.1.0
4614           *
4615           * @param bool   $bad_slug  Whether the post slug would be bad as a flat slug.
4616           * @param string $slug      The post slug.
4617           * @param string $post_type Post type.
4618           */
4619          $is_bad_flat_slug = apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type );
4620  
4621          if ( $post_name_check
4622              || in_array( $slug, $feeds, true ) || 'embed' === $slug
4623              || $conflicts_with_date_archive
4624              || $is_bad_flat_slug
4625          ) {
4626              $suffix = 2;
4627              do {
4628                  $alt_post_name   = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
4629                  $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
4630                  $suffix++;
4631              } while ( $post_name_check );
4632              $slug = $alt_post_name;
4633          }
4634      }
4635  
4636      /**
4637       * Filters the unique post slug.
4638       *
4639       * @since 3.3.0
4640       *
4641       * @param string $slug          The post slug.
4642       * @param int    $post_ID       Post ID.
4643       * @param string $post_status   The post status.
4644       * @param string $post_type     Post type.
4645       * @param int    $post_parent   Post parent ID
4646       * @param string $original_slug The original post slug.
4647       */
4648      return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
4649  }
4650  
4651  /**
4652   * Truncate a post slug.
4653   *
4654   * @since 3.6.0
4655   * @access private
4656   *
4657   * @see utf8_uri_encode()
4658   *
4659   * @param string $slug   The slug to truncate.
4660   * @param int    $length Optional. Max length of the slug. Default 200 (characters).
4661   * @return string The truncated slug.
4662   */
4663  function _truncate_post_slug( $slug, $length = 200 ) {
4664      if ( strlen( $slug ) > $length ) {
4665          $decoded_slug = urldecode( $slug );
4666          if ( $decoded_slug === $slug ) {
4667              $slug = substr( $slug, 0, $length );
4668          } else {
4669              $slug = utf8_uri_encode( $decoded_slug, $length );
4670          }
4671      }
4672  
4673      return rtrim( $slug, '-' );
4674  }
4675  
4676  /**
4677   * Add tags to a post.
4678   *
4679   * @see wp_set_post_tags()
4680   *
4681   * @since 2.3.0
4682   *
4683   * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
4684   * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
4685   *                              separated by commas. Default empty.
4686   * @return array|false|WP_Error Array of affected term IDs. WP_Error or false on failure.
4687   */
4688  function wp_add_post_tags( $post_id = 0, $tags = '' ) {
4689      return wp_set_post_tags( $post_id, $tags, true );
4690  }
4691  
4692  /**
4693   * Set the tags for a post.
4694   *
4695   * @since 2.3.0
4696   *
4697   * @see wp_set_object_terms()
4698   *
4699   * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
4700   * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
4701   *                              separated by commas. Default empty.
4702   * @param bool         $append  Optional. If true, don't delete existing tags, just add on. If false,
4703   *                              replace the tags with the new tags. Default false.
4704   * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
4705   */
4706  function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) {
4707      return wp_set_post_terms( $post_id, $tags, 'post_tag', $append );
4708  }
4709  
4710  /**
4711   * Set the terms for a post.
4712   *
4713   * @since 2.8.0
4714   *
4715   * @see wp_set_object_terms()
4716   *
4717   * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the global $post.
4718   * @param string|array $tags     Optional. An array of terms to set for the post, or a string of terms
4719   *                               separated by commas. Hierarchical taxonomies must always pass IDs rather
4720   *                               than names so that children with the same names but different parents
4721   *                               aren't confused. Default empty.
4722   * @param string       $taxonomy Optional. Taxonomy name. Default 'post_tag'.
4723   * @param bool         $append   Optional. If true, don't delete existing terms, just add on. If false,
4724   *                               replace the terms with the new terms. Default false.
4725   * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
4726   */
4727  function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
4728      $post_id = (int) $post_id;
4729  
4730      if ( ! $post_id ) {
4731          return false;
4732      }
4733  
4734      if ( empty( $tags ) ) {
4735          $tags = array();
4736      }
4737  
4738      if ( ! is_array( $tags ) ) {
4739          $comma = _x( ',', 'tag delimiter' );
4740          if ( ',' !== $comma ) {
4741              $tags = str_replace( $comma, ',', $tags );
4742          }
4743          $tags = explode( ',', trim( $tags, " \n\t\r\0\x0B," ) );
4744      }
4745  
4746      /*
4747       * Hierarchical taxonomies must always pass IDs rather than names so that
4748       * children with the same names but different parents aren't confused.
4749       */
4750      if ( is_taxonomy_hierarchical( $taxonomy ) ) {
4751          $tags = array_unique( array_map( 'intval', $tags ) );
4752      }
4753  
4754      return wp_set_object_terms( $post_id, $tags, $taxonomy, $append );
4755  }
4756  
4757  /**
4758   * Set categories for a post.
4759   *
4760   * If no categories are provided, the default category is used.
4761   *
4762   * @since 2.1.0
4763   *
4764   * @param int       $post_ID         Optional. The Post ID. Does not default to the ID
4765   *                                   of the global $post. Default 0.
4766   * @param array|int $post_categories Optional. List of category IDs, or the ID of a single category.
4767   *                                   Default empty array.
4768   * @param bool      $append          If true, don't delete existing categories, just add on.
4769   *                                   If false, replace the categories with the new categories.
4770   * @return array|false|WP_Error Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
4771   */
4772  function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
4773      $post_ID     = (int) $post_ID;
4774      $post_type   = get_post_type( $post_ID );
4775      $post_status = get_post_status( $post_ID );
4776  
4777      // If $post_categories isn't already an array, make it one.
4778      $post_categories = (array) $post_categories;
4779  
4780      if ( empty( $post_categories ) ) {
4781          /**
4782           * Filters post types (in addition to 'post') that require a default category.
4783           *
4784           * @since 5.5.0
4785           *
4786           * @param string[] $post_types An array of post type names. Default empty array.
4787           */
4788          $default_category_post_types = apply_filters( 'default_category_post_types', array() );
4789  
4790          // Regular posts always require a default category.
4791          $default_category_post_types = array_merge( $default_category_post_types, array( 'post' ) );
4792  
4793          if ( in_array( $post_type, $default_category_post_types, true )
4794              && is_object_in_taxonomy( $post_type, 'category' )
4795              && 'auto-draft' !== $post_status
4796          ) {
4797              $post_categories = array( get_option( 'default_category' ) );
4798              $append          = false;
4799          } else {
4800              $post_categories = array();
4801          }
4802      } elseif ( 1 === count( $post_categories ) && '' === reset( $post_categories ) ) {
4803          return true;
4804      }
4805  
4806      return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
4807  }
4808  
4809  /**
4810   * Fires actions related to the transitioning of a post's status.
4811   *
4812   * When a post is saved, the post status is "transitioned" from one status to another,
4813   * though this does not always mean the status has actually changed before and after
4814   * the save. This function fires a number of action hooks related to that transition:
4815   * the generic {@see 'transition_post_status'} action, as well as the dynamic hooks
4816   * {@see '$old_status_to_$new_status'} and {@see '$new_status_$post->post_type'}. Note
4817   * that the function does not transition the post object in the database.
4818   *
4819   * For instance: When publishing a post for the first time, the post status may transition
4820   * from 'draft' – or some other status – to 'publish'. However, if a post is already
4821   * published and is simply being updated, the "old" and "new" statuses may both be 'publish'
4822   * before and after the transition.
4823   *
4824   * @since 2.3.0
4825   *
4826   * @param string  $new_status Transition to this post status.
4827   * @param string  $old_status Previous post status.
4828   * @param WP_Post $post Post data.
4829   */
4830  function wp_transition_post_status( $new_status, $old_status, $post ) {
4831      /**
4832       * Fires when a post is transitioned from one status to another.
4833       *
4834       * @since 2.3.0
4835       *
4836       * @param string  $new_status New post status.
4837       * @param string  $old_status Old post status.
4838       * @param WP_Post $post       Post object.
4839       */
4840      do_action( 'transition_post_status', $new_status, $old_status, $post );
4841  
4842      /**
4843       * Fires when a post is transitioned from one status to another.
4844       *
4845       * The dynamic portions of the hook name, `$new_status` and `$old status`,
4846       * refer to the old and new post statuses, respectively.
4847       *
4848       * @since 2.3.0
4849       *
4850       * @param WP_Post $post Post object.
4851       */
4852      do_action( "{$old_status}_to_{$new_status}", $post );
4853  
4854      /**
4855       * Fires when a post is transitioned from one status to another.
4856       *
4857       * The dynamic portions of the hook name, `$new_status` and `$post->post_type`,
4858       * refer to the new post status and post type, respectively.
4859       *
4860       * Please note: When this action is hooked using a particular post status (like
4861       * 'publish', as `publish_{$post->post_type}`), it will fire both when a post is
4862       * first transitioned to that status from something else, as well as upon
4863       * subsequent post updates (old and new status are both the same).
4864       *
4865       * Therefore, if you are looking to only fire a callback when a post is first
4866       * transitioned to a status, use the {@see 'transition_post_status'} hook instead.
4867       *
4868       * @since 2.3.0
4869       *
4870       * @param int     $post_id Post ID.
4871       * @param WP_Post $post    Post object.
4872       */
4873      do_action( "{$new_status}_{$post->post_type}", $post->ID, $post );
4874  }
4875  
4876  //
4877  // Comment, trackback, and pingback functions.
4878  //
4879  
4880  /**
4881   * Add a URL to those already pinged.
4882   *
4883   * @since 1.5.0
4884   * @since 4.7.0 `$post_id` can be a WP_Post object.
4885   * @since 4.7.0 `$uri` can be an array of URIs.
4886   *
4887   * @global wpdb $wpdb WordPress database abstraction object.
4888   *
4889   * @param int|WP_Post  $post_id Post object or ID.
4890   * @param string|array $uri     Ping URI or array of URIs.
4891   * @return int|false How many rows were updated.
4892   */
4893  function add_ping( $post_id, $uri ) {
4894      global $wpdb;
4895  
4896      $post = get_post( $post_id );
4897      if ( ! $post ) {
4898          return false;
4899      }
4900  
4901      $pung = trim( $post->pinged );
4902      $pung = preg_split( '/\s/', $pung );
4903  
4904      if ( is_array( $uri ) ) {
4905          $pung = array_merge( $pung, $uri );
4906      } else {
4907          $pung[] = $uri;
4908      }
4909      $new = implode( "\n", $pung );
4910  
4911      /**
4912       * Filters the new ping URL to add for the given post.
4913       *
4914       * @since 2.0.0
4915       *
4916       * @param string $new New ping URL to add.
4917       */
4918      $new = apply_filters( 'add_ping', $new );
4919  
4920      $return = $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post->ID ) );
4921      clean_post_cache( $post->ID );
4922      return $return;
4923  }
4924  
4925  /**
4926   * Retrieve enclosures already enclosed for a post.
4927   *
4928   * @since 1.5.0
4929   *
4930   * @param int $post_id Post ID.
4931   * @return string[] Array of enclosures for the given post.
4932   */
4933  function get_enclosed( $post_id ) {
4934      $custom_fields = get_post_custom( $post_id );
4935      $pung          = array();
4936      if ( ! is_array( $custom_fields ) ) {
4937          return $pung;
4938      }
4939  
4940      foreach ( $custom_fields as $key => $val ) {
4941          if ( 'enclosure' !== $key || ! is_array( $val ) ) {
4942              continue;
4943          }
4944          foreach ( $val as $enc ) {
4945              $enclosure = explode( "\n", $enc );
4946              $pung[]    = trim( $enclosure[0] );
4947          }
4948      }
4949  
4950      /**
4951       * Filters the list of enclosures already enclosed for the given post.
4952       *
4953       * @since 2.0.0
4954       *
4955       * @param string[] $pung    Array of enclosures for the given post.
4956       * @param int      $post_id Post ID.
4957       */
4958      return apply_filters( 'get_enclosed', $pung, $post_id );
4959  }
4960  
4961  /**
4962   * Retrieve URLs already pinged for a post.
4963   *
4964   * @since 1.5.0
4965   *
4966   * @since 4.7.0 `$post_id` can be a WP_Post object.
4967   *
4968   * @param int|WP_Post $post_id Post ID or object.
4969   * @return bool|string[] Array of URLs already pinged for the given post, false if the post is not found.
4970   */
4971  function get_pung( $post_id ) {
4972      $post = get_post( $post_id );
4973      if ( ! $post ) {
4974          return false;
4975      }
4976  
4977      $pung = trim( $post->pinged );
4978      $pung = preg_split( '/\s/', $pung );
4979  
4980      /**
4981       * Filters the list of already-pinged URLs for the given post.
4982       *
4983       * @since 2.0.0
4984       *
4985       * @param string[] $pung Array of URLs already pinged for the given post.
4986       */
4987      return apply_filters( 'get_pung', $pung );
4988  }
4989  
4990  /**
4991   * Retrieve URLs that need to be pinged.
4992   *
4993   * @since 1.5.0
4994   * @since 4.7.0 `$post_id` can be a WP_Post object.
4995   *
4996   * @param int|WP_Post $post_id Post Object or ID
4997   * @return string[]|false List of URLs yet to ping.
4998   */
4999  function get_to_ping( $post_id ) {
5000      $post = get_post( $post_id );
5001  
5002      if ( ! $post ) {
5003          return false;
5004      }
5005  
5006      $to_ping = sanitize_trackback_urls( $post->to_ping );
5007      $to_ping = preg_split( '/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY );
5008  
5009      /**
5010       * Filters the list of URLs yet to ping for the given post.
5011       *
5012       * @since 2.0.0
5013       *
5014       * @param string[] $to_ping List of URLs yet to ping.
5015       */
5016      return apply_filters( 'get_to_ping', $to_ping );
5017  }
5018  
5019  /**
5020   * Do trackbacks for a list of URLs.
5021   *
5022   * @since 1.0.0
5023   *
5024   * @param string $tb_list Comma separated list of URLs.
5025   * @param int    $post_id Post ID.
5026   */
5027  function trackback_url_list( $tb_list, $post_id ) {
5028      if ( ! empty( $tb_list ) ) {
5029          // Get post data.
5030          $postdata = get_post( $post_id, ARRAY_A );
5031  
5032          // Form an excerpt.
5033          $excerpt = strip_tags( $postdata['post_excerpt'] ? $postdata['post_excerpt'] : $postdata['post_content'] );
5034  
5035          if ( strlen( $excerpt ) > 255 ) {
5036              $excerpt = substr( $excerpt, 0, 252 ) . '&hellip;';
5037          }
5038  
5039          $trackback_urls = explode( ',', $tb_list );
5040          foreach ( (array) $trackback_urls as $tb_url ) {
5041              $tb_url = trim( $tb_url );
5042              trackback( $tb_url, wp_unslash( $postdata['post_title'] ), $excerpt, $post_id );
5043          }
5044      }
5045  }
5046  
5047  //
5048  // Page functions.
5049  //
5050  
5051  /**
5052   * Get a list of page IDs.
5053   *
5054   * @since 2.0.0
5055   *
5056   * @global wpdb $wpdb WordPress database abstraction object.
5057   *
5058   * @return string[] List of page IDs as strings.
5059   */
5060  function get_all_page_ids() {
5061      global $wpdb;
5062  
5063      $page_ids = wp_cache_get( 'all_page_ids', 'posts' );
5064      if ( ! is_array( $page_ids ) ) {
5065          $page_ids = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_type = 'page'" );
5066          wp_cache_add( 'all_page_ids', $page_ids, 'posts' );
5067      }
5068  
5069      return $page_ids;
5070  }
5071  
5072  /**
5073   * Retrieves page data given a page ID or page object.
5074   *
5075   * Use get_post() instead of get_page().
5076   *
5077   * @since 1.5.1
5078   * @deprecated 3.5.0 Use get_post()
5079   *
5080   * @param int|WP_Post $page   Page object or page ID. Passed by reference.
5081   * @param string      $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
5082   *                            correspond to a WP_Post object, an associative array, or a numeric array,
5083   *                            respectively. Default OBJECT.
5084   * @param string      $filter Optional. How the return value should be filtered. Accepts 'raw',
5085   *                            'edit', 'db', 'display'. Default 'raw'.
5086   * @return WP_Post|array|null WP_Post or array on success, null on failure.
5087   */
5088  function get_page( $page, $output = OBJECT, $filter = 'raw' ) {
5089      return get_post( $page, $output, $filter );
5090  }
5091  
5092  /**
5093   * Retrieves a page given its path.
5094   *
5095   * @since 2.1.0
5096   *
5097   * @global wpdb $wpdb WordPress database abstraction object.
5098   *
5099   * @param string       $page_path Page path.
5100   * @param string       $output    Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
5101   *                                correspond to a WP_Post object, an associative array, or a numeric array,
5102   *                                respectively. Default OBJECT.
5103   * @param string|array $post_type Optional. Post type or array of post types. Default 'page'.
5104   * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
5105   */
5106  function get_page_by_path( $page_path, $output = OBJECT, $post_type = 'page' ) {
5107      global $wpdb;
5108  
5109      $last_changed = wp_cache_get_last_changed( 'posts' );
5110  
5111      $hash      = md5( $page_path . serialize( $post_type ) );
5112      $cache_key = "get_page_by_path:$hash:$last_changed";
5113      $cached    = wp_cache_get( $cache_key, 'posts' );
5114      if ( false !== $cached ) {
5115          // Special case: '0' is a bad `$page_path`.
5116          if ( '0' === $cached || 0 === $cached ) {
5117              return;
5118          } else {
5119              return get_post( $cached, $output );
5120          }
5121      }
5122  
5123      $page_path     = rawurlencode( urldecode( $page_path ) );
5124      $page_path     = str_replace( '%2F', '/', $page_path );
5125      $page_path     = str_replace( '%20', ' ', $page_path );
5126      $parts         = explode( '/', trim( $page_path, '/' ) );
5127      $parts         = array_map( 'sanitize_title_for_query', $parts );
5128      $escaped_parts = esc_sql( $parts );
5129  
5130      $in_string = "'" . implode( "','", $escaped_parts ) . "'";
5131  
5132      if ( is_array( $post_type ) ) {
5133          $post_types = $post_type;
5134      } else {
5135          $post_types = array( $post_type, 'attachment' );
5136      }
5137  
5138      $post_types          = esc_sql( $post_types );
5139      $post_type_in_string = "'" . implode( "','", $post_types ) . "'";
5140      $sql                 = "
5141          SELECT ID, post_name, post_parent, post_type
5142          FROM $wpdb->posts
5143          WHERE post_name IN ($in_string)
5144          AND post_type IN ($post_type_in_string)
5145      ";
5146  
5147      $pages = $wpdb->get_results( $sql, OBJECT_K );
5148  
5149      $revparts = array_reverse( $parts );
5150  
5151      $foundid = 0;
5152      foreach ( (array) $pages as $page ) {
5153          if ( $page->post_name == $revparts[0] ) {
5154              $count = 0;
5155              $p     = $page;
5156  
5157              /*
5158               * Loop through the given path parts from right to left,
5159               * ensuring each matches the post ancestry.
5160               */
5161              while ( 0 != $p->post_parent && isset( $pages[ $p->post_parent ] ) ) {
5162                  $count++;
5163                  $parent = $pages[ $p->post_parent ];
5164                  if ( ! isset( $revparts[ $count ] ) || $parent->post_name != $revparts[ $count ] ) {
5165                      break;
5166                  }
5167                  $p = $parent;
5168              }
5169  
5170              if ( 0 == $p->post_parent && count( $revparts ) == $count + 1 && $p->post_name == $revparts[ $count ] ) {
5171                  $foundid = $page->ID;
5172                  if ( $page->post_type == $post_type ) {
5173                      break;
5174                  }
5175              }
5176          }
5177      }
5178  
5179      // We cache misses as well as hits.
5180      wp_cache_set( $cache_key, $foundid, 'posts' );