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

   1  <?php
   2  /**
   3   * Theme, template, and stylesheet functions.
   4   *
   5   * @package WordPress
   6   * @subpackage Theme
   7   */
   8  
   9  /**
  10   * Returns an array of WP_Theme objects based on the arguments.
  11   *
  12   * Despite advances over get_themes(), this function is quite expensive, and grows
  13   * linearly with additional themes. Stick to wp_get_theme() if possible.
  14   *
  15   * @since 3.4.0
  16   *
  17   * @global array $wp_theme_directories
  18   *
  19   * @param array $args {
  20   *     Optional. The search arguments.
  21   *
  22   *     @type mixed $errors  True to return themes with errors, false to return
  23   *                          themes without errors, null to return all themes.
  24   *                          Default false.
  25   *     @type mixed $allowed (Multisite) True to return only allowed themes for a site.
  26   *                          False to return only disallowed themes for a site.
  27   *                          'site' to return only site-allowed themes.
  28   *                          'network' to return only network-allowed themes.
  29   *                          Null to return all themes. Default null.
  30   *     @type int   $blog_id (Multisite) The blog ID used to calculate which themes
  31   *                          are allowed. Default 0, synonymous for the current blog.
  32   * }
  33   * @return WP_Theme[] Array of WP_Theme objects.
  34   */
  35  function wp_get_themes( $args = array() ) {
  36      global $wp_theme_directories;
  37  
  38      $defaults = array(
  39          'errors'  => false,
  40          'allowed' => null,
  41          'blog_id' => 0,
  42      );
  43      $args     = wp_parse_args( $args, $defaults );
  44  
  45      $theme_directories = search_theme_directories();
  46  
  47      if ( is_array( $wp_theme_directories ) && count( $wp_theme_directories ) > 1 ) {
  48          // Make sure the current theme wins out, in case search_theme_directories() picks the wrong
  49          // one in the case of a conflict. (Normally, last registered theme root wins.)
  50          $current_theme = get_stylesheet();
  51          if ( isset( $theme_directories[ $current_theme ] ) ) {
  52              $root_of_current_theme = get_raw_theme_root( $current_theme );
  53              if ( ! in_array( $root_of_current_theme, $wp_theme_directories, true ) ) {
  54                  $root_of_current_theme = WP_CONTENT_DIR . $root_of_current_theme;
  55              }
  56              $theme_directories[ $current_theme ]['theme_root'] = $root_of_current_theme;
  57          }
  58      }
  59  
  60      if ( empty( $theme_directories ) ) {
  61          return array();
  62      }
  63  
  64      if ( is_multisite() && null !== $args['allowed'] ) {
  65          $allowed = $args['allowed'];
  66          if ( 'network' === $allowed ) {
  67              $theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed_on_network() );
  68          } elseif ( 'site' === $allowed ) {
  69              $theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed_on_site( $args['blog_id'] ) );
  70          } elseif ( $allowed ) {
  71              $theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed( $args['blog_id'] ) );
  72          } else {
  73              $theme_directories = array_diff_key( $theme_directories, WP_Theme::get_allowed( $args['blog_id'] ) );
  74          }
  75      }
  76  
  77      $themes         = array();
  78      static $_themes = array();
  79  
  80      foreach ( $theme_directories as $theme => $theme_root ) {
  81          if ( isset( $_themes[ $theme_root['theme_root'] . '/' . $theme ] ) ) {
  82              $themes[ $theme ] = $_themes[ $theme_root['theme_root'] . '/' . $theme ];
  83          } else {
  84              $themes[ $theme ] = new WP_Theme( $theme, $theme_root['theme_root'] );
  85  
  86              $_themes[ $theme_root['theme_root'] . '/' . $theme ] = $themes[ $theme ];
  87          }
  88      }
  89  
  90      if ( null !== $args['errors'] ) {
  91          foreach ( $themes as $theme => $wp_theme ) {
  92              if ( $wp_theme->errors() != $args['errors'] ) {
  93                  unset( $themes[ $theme ] );
  94              }
  95          }
  96      }
  97  
  98      return $themes;
  99  }
 100  
 101  /**
 102   * Gets a WP_Theme object for a theme.
 103   *
 104   * @since 3.4.0
 105   *
 106   * @global array $wp_theme_directories
 107   *
 108   * @param string $stylesheet Optional. Directory name for the theme. Defaults to current theme.
 109   * @param string $theme_root Optional. Absolute path of the theme root to look in.
 110   *                           If not specified, get_raw_theme_root() is used to calculate
 111   *                           the theme root for the $stylesheet provided (or current theme).
 112   * @return WP_Theme Theme object. Be sure to check the object's exists() method
 113   *                  if you need to confirm the theme's existence.
 114   */
 115  function wp_get_theme( $stylesheet = '', $theme_root = '' ) {
 116      global $wp_theme_directories;
 117  
 118      if ( empty( $stylesheet ) ) {
 119          $stylesheet = get_stylesheet();
 120      }
 121  
 122      if ( empty( $theme_root ) ) {
 123          $theme_root = get_raw_theme_root( $stylesheet );
 124          if ( false === $theme_root ) {
 125              $theme_root = WP_CONTENT_DIR . '/themes';
 126          } elseif ( ! in_array( $theme_root, (array) $wp_theme_directories, true ) ) {
 127              $theme_root = WP_CONTENT_DIR . $theme_root;
 128          }
 129      }
 130  
 131      return new WP_Theme( $stylesheet, $theme_root );
 132  }
 133  
 134  /**
 135   * Clears the cache held by get_theme_roots() and WP_Theme.
 136   *
 137   * @since 3.5.0
 138   * @param bool $clear_update_cache Whether to clear the theme updates cache.
 139   */
 140  function wp_clean_themes_cache( $clear_update_cache = true ) {
 141      if ( $clear_update_cache ) {
 142          delete_site_transient( 'update_themes' );
 143      }
 144      search_theme_directories( true );
 145      foreach ( wp_get_themes( array( 'errors' => null ) ) as $theme ) {
 146          $theme->cache_delete();
 147      }
 148  }
 149  
 150  /**
 151   * Whether a child theme is in use.
 152   *
 153   * @since 3.0.0
 154   *
 155   * @return bool True if a child theme is in use, false otherwise.
 156   */
 157  function is_child_theme() {
 158      return ( TEMPLATEPATH !== STYLESHEETPATH );
 159  }
 160  
 161  /**
 162   * Retrieves name of the current stylesheet.
 163   *
 164   * The theme name that is currently set as the front end theme.
 165   *
 166   * For all intents and purposes, the template name and the stylesheet name
 167   * are going to be the same for most cases.
 168   *
 169   * @since 1.5.0
 170   *
 171   * @return string Stylesheet name.
 172   */
 173  function get_stylesheet() {
 174      /**
 175       * Filters the name of current stylesheet.
 176       *
 177       * @since 1.5.0
 178       *
 179       * @param string $stylesheet Name of the current stylesheet.
 180       */
 181      return apply_filters( 'stylesheet', get_option( 'stylesheet' ) );
 182  }
 183  
 184  /**
 185   * Retrieves stylesheet directory path for current theme.
 186   *
 187   * @since 1.5.0
 188   *
 189   * @return string Path to current theme's stylesheet directory.
 190   */
 191  function get_stylesheet_directory() {
 192      $stylesheet     = get_stylesheet();
 193      $theme_root     = get_theme_root( $stylesheet );
 194      $stylesheet_dir = "$theme_root/$stylesheet";
 195  
 196      /**
 197       * Filters the stylesheet directory path for current theme.
 198       *
 199       * @since 1.5.0
 200       *
 201       * @param string $stylesheet_dir Absolute path to the current theme.
 202       * @param string $stylesheet     Directory name of the current theme.
 203       * @param string $theme_root     Absolute path to themes directory.
 204       */
 205      return apply_filters( 'stylesheet_directory', $stylesheet_dir, $stylesheet, $theme_root );
 206  }
 207  
 208  /**
 209   * Retrieves stylesheet directory URI for current theme.
 210   *
 211   * @since 1.5.0
 212   *
 213   * @return string URI to current theme's stylesheet directory.
 214   */
 215  function get_stylesheet_directory_uri() {
 216      $stylesheet         = str_replace( '%2F', '/', rawurlencode( get_stylesheet() ) );
 217      $theme_root_uri     = get_theme_root_uri( $stylesheet );
 218      $stylesheet_dir_uri = "$theme_root_uri/$stylesheet";
 219  
 220      /**
 221       * Filters the stylesheet directory URI.
 222       *
 223       * @since 1.5.0
 224       *
 225       * @param string $stylesheet_dir_uri Stylesheet directory URI.
 226       * @param string $stylesheet         Name of the activated theme's directory.
 227       * @param string $theme_root_uri     Themes root URI.
 228       */
 229      return apply_filters( 'stylesheet_directory_uri', $stylesheet_dir_uri, $stylesheet, $theme_root_uri );
 230  }
 231  
 232  /**
 233   * Retrieves stylesheet URI for current theme.
 234   *
 235   * The stylesheet file name is 'style.css' which is appended to the stylesheet directory URI path.
 236   * See get_stylesheet_directory_uri().
 237   *
 238   * @since 1.5.0
 239   *
 240   * @return string URI to current theme's stylesheet.
 241   */
 242  function get_stylesheet_uri() {
 243      $stylesheet_dir_uri = get_stylesheet_directory_uri();
 244      $stylesheet_uri     = $stylesheet_dir_uri . '/style.css';
 245      /**
 246       * Filters the URI of the current theme stylesheet.
 247       *
 248       * @since 1.5.0
 249       *
 250       * @param string $stylesheet_uri     Stylesheet URI for the current theme/child theme.
 251       * @param string $stylesheet_dir_uri Stylesheet directory URI for the current theme/child theme.
 252       */
 253      return apply_filters( 'stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri );
 254  }
 255  
 256  /**
 257   * Retrieves the localized stylesheet URI.
 258   *
 259   * The stylesheet directory for the localized stylesheet files are located, by
 260   * default, in the base theme directory. The name of the locale file will be the
 261   * locale followed by '.css'. If that does not exist, then the text direction
 262   * stylesheet will be checked for existence, for example 'ltr.css'.
 263   *
 264   * The theme may change the location of the stylesheet directory by either using
 265   * the {@see 'stylesheet_directory_uri'} or {@see 'locale_stylesheet_uri'} filters.
 266   *
 267   * If you want to change the location of the stylesheet files for the entire
 268   * WordPress workflow, then change the former. If you just have the locale in a
 269   * separate folder, then change the latter.
 270   *
 271   * @since 2.1.0
 272   *
 273   * @global WP_Locale $wp_locale WordPress date and time locale object.
 274   *
 275   * @return string URI to current theme's localized stylesheet.
 276   */
 277  function get_locale_stylesheet_uri() {
 278      global $wp_locale;
 279      $stylesheet_dir_uri = get_stylesheet_directory_uri();
 280      $dir                = get_stylesheet_directory();
 281      $locale             = get_locale();
 282      if ( file_exists( "$dir/$locale.css" ) ) {
 283          $stylesheet_uri = "$stylesheet_dir_uri/$locale.css";
 284      } elseif ( ! empty( $wp_locale->text_direction ) && file_exists( "$dir/{$wp_locale->text_direction}.css" ) ) {
 285          $stylesheet_uri = "$stylesheet_dir_uri/{$wp_locale->text_direction}.css";
 286      } else {
 287          $stylesheet_uri = '';
 288      }
 289      /**
 290       * Filters the localized stylesheet URI.
 291       *
 292       * @since 2.1.0
 293       *
 294       * @param string $stylesheet_uri     Localized stylesheet URI.
 295       * @param string $stylesheet_dir_uri Stylesheet directory URI.
 296       */
 297      return apply_filters( 'locale_stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri );
 298  }
 299  
 300  /**
 301   * Retrieves name of the current theme.
 302   *
 303   * @since 1.5.0
 304   *
 305   * @return string Template name.
 306   */
 307  function get_template() {
 308      /**
 309       * Filters the name of the current theme.
 310       *
 311       * @since 1.5.0
 312       *
 313       * @param string $template Current theme's directory name.
 314       */
 315      return apply_filters( 'template', get_option( 'template' ) );
 316  }
 317  
 318  /**
 319   * Retrieves template directory path for current theme.
 320   *
 321   * @since 1.5.0
 322   *
 323   * @return string Path to current theme's template directory.
 324   */
 325  function get_template_directory() {
 326      $template     = get_template();
 327      $theme_root   = get_theme_root( $template );
 328      $template_dir = "$theme_root/$template";
 329  
 330      /**
 331       * Filters the current theme directory path.
 332       *
 333       * @since 1.5.0
 334       *
 335       * @param string $template_dir The path of the current theme directory.
 336       * @param string $template     Directory name of the current theme.
 337       * @param string $theme_root   Absolute path to the themes directory.
 338       */
 339      return apply_filters( 'template_directory', $template_dir, $template, $theme_root );
 340  }
 341  
 342  /**
 343   * Retrieves template directory URI for current theme.
 344   *
 345   * @since 1.5.0
 346   *
 347   * @return string URI to current theme's template directory.
 348   */
 349  function get_template_directory_uri() {
 350      $template         = str_replace( '%2F', '/', rawurlencode( get_template() ) );
 351      $theme_root_uri   = get_theme_root_uri( $template );
 352      $template_dir_uri = "$theme_root_uri/$template";
 353  
 354      /**
 355       * Filters the current theme directory URI.
 356       *
 357       * @since 1.5.0
 358       *
 359       * @param string $template_dir_uri The URI of the current theme directory.
 360       * @param string $template         Directory name of the current theme.
 361       * @param string $theme_root_uri   The themes root URI.
 362       */
 363      return apply_filters( 'template_directory_uri', $template_dir_uri, $template, $theme_root_uri );
 364  }
 365  
 366  /**
 367   * Retrieves theme roots.
 368   *
 369   * @since 2.9.0
 370   *
 371   * @global array $wp_theme_directories
 372   *
 373   * @return array|string An array of theme roots keyed by template/stylesheet
 374   *                      or a single theme root if all themes have the same root.
 375   */
 376  function get_theme_roots() {
 377      global $wp_theme_directories;
 378  
 379      if ( ! is_array( $wp_theme_directories ) || count( $wp_theme_directories ) <= 1 ) {
 380          return '/themes';
 381      }
 382  
 383      $theme_roots = get_site_transient( 'theme_roots' );
 384      if ( false === $theme_roots ) {
 385          search_theme_directories( true ); // Regenerate the transient.
 386          $theme_roots = get_site_transient( 'theme_roots' );
 387      }
 388      return $theme_roots;
 389  }
 390  
 391  /**
 392   * Registers a directory that contains themes.
 393   *
 394   * @since 2.9.0
 395   *
 396   * @global array $wp_theme_directories
 397   *
 398   * @param string $directory Either the full filesystem path to a theme folder
 399   *                          or a folder within WP_CONTENT_DIR.
 400   * @return bool True if successfully registered a directory that contains themes,
 401   *              false if the directory does not exist.
 402   */
 403  function register_theme_directory( $directory ) {
 404      global $wp_theme_directories;
 405  
 406      if ( ! file_exists( $directory ) ) {
 407          // Try prepending as the theme directory could be relative to the content directory.
 408          $directory = WP_CONTENT_DIR . '/' . $directory;
 409          // If this directory does not exist, return and do not register.
 410          if ( ! file_exists( $directory ) ) {
 411              return false;
 412          }
 413      }
 414  
 415      if ( ! is_array( $wp_theme_directories ) ) {
 416          $wp_theme_directories = array();
 417      }
 418  
 419      $untrailed = untrailingslashit( $directory );
 420      if ( ! empty( $untrailed ) && ! in_array( $untrailed, $wp_theme_directories, true ) ) {
 421          $wp_theme_directories[] = $untrailed;
 422      }
 423  
 424      return true;
 425  }
 426  
 427  /**
 428   * Searches all registered theme directories for complete and valid themes.
 429   *
 430   * @since 2.9.0
 431   *
 432   * @global array $wp_theme_directories
 433   *
 434   * @param bool $force Optional. Whether to force a new directory scan. Default false.
 435   * @return array|false Valid themes found on success, false on failure.
 436   */
 437  function search_theme_directories( $force = false ) {
 438      global $wp_theme_directories;
 439      static $found_themes = null;
 440  
 441      if ( empty( $wp_theme_directories ) ) {
 442          return false;
 443      }
 444  
 445      if ( ! $force && isset( $found_themes ) ) {
 446          return $found_themes;
 447      }
 448  
 449      $found_themes = array();
 450  
 451      $wp_theme_directories = (array) $wp_theme_directories;
 452      $relative_theme_roots = array();
 453  
 454      /*
 455       * Set up maybe-relative, maybe-absolute array of theme directories.
 456       * We always want to return absolute, but we need to cache relative
 457       * to use in get_theme_root().
 458       */
 459      foreach ( $wp_theme_directories as $theme_root ) {
 460          if ( 0 === strpos( $theme_root, WP_CONTENT_DIR ) ) {
 461              $relative_theme_roots[ str_replace( WP_CONTENT_DIR, '', $theme_root ) ] = $theme_root;
 462          } else {
 463              $relative_theme_roots[ $theme_root ] = $theme_root;
 464          }
 465      }
 466  
 467      /**
 468       * Filters whether to get the cache of the registered theme directories.
 469       *
 470       * @since 3.4.0
 471       *
 472       * @param bool   $cache_expiration Whether to get the cache of the theme directories. Default false.
 473       * @param string $context          The class or function name calling the filter.
 474       */
 475      $cache_expiration = apply_filters( 'wp_cache_themes_persistently', false, 'search_theme_directories' );
 476  
 477      if ( $cache_expiration ) {
 478          $cached_roots = get_site_transient( 'theme_roots' );
 479          if ( is_array( $cached_roots ) ) {
 480              foreach ( $cached_roots as $theme_dir => $theme_root ) {
 481                  // A cached theme root is no longer around, so skip it.
 482                  if ( ! isset( $relative_theme_roots[ $theme_root ] ) ) {
 483                      continue;
 484                  }
 485                  $found_themes[ $theme_dir ] = array(
 486                      'theme_file' => $theme_dir . '/style.css',
 487                      'theme_root' => $relative_theme_roots[ $theme_root ], // Convert relative to absolute.
 488                  );
 489              }
 490              return $found_themes;
 491          }
 492          if ( ! is_int( $cache_expiration ) ) {
 493              $cache_expiration = 30 * MINUTE_IN_SECONDS;
 494          }
 495      } else {
 496          $cache_expiration = 30 * MINUTE_IN_SECONDS;
 497      }
 498  
 499      /* Loop the registered theme directories and extract all themes */
 500      foreach ( $wp_theme_directories as $theme_root ) {
 501  
 502          // Start with directories in the root of the current theme directory.
 503          $dirs = @ scandir( $theme_root );
 504          if ( ! $dirs ) {
 505              trigger_error( "$theme_root is not readable", E_USER_NOTICE );
 506              continue;
 507          }
 508          foreach ( $dirs as $dir ) {
 509              if ( ! is_dir( $theme_root . '/' . $dir ) || '.' === $dir[0] || 'CVS' === $dir ) {
 510                  continue;
 511              }
 512              if ( file_exists( $theme_root . '/' . $dir . '/style.css' ) ) {
 513                  // wp-content/themes/a-single-theme
 514                  // wp-content/themes is $theme_root, a-single-theme is $dir.
 515                  $found_themes[ $dir ] = array(
 516                      'theme_file' => $dir . '/style.css',
 517                      'theme_root' => $theme_root,
 518                  );
 519              } else {
 520                  $found_theme = false;
 521                  // wp-content/themes/a-folder-of-themes/*
 522                  // wp-content/themes is $theme_root, a-folder-of-themes is $dir, then themes are $sub_dirs.
 523                  $sub_dirs = @ scandir( $theme_root . '/' . $dir );
 524                  if ( ! $sub_dirs ) {
 525                      trigger_error( "$theme_root/$dir is not readable", E_USER_NOTICE );
 526                      continue;
 527                  }
 528                  foreach ( $sub_dirs as $sub_dir ) {
 529                      if ( ! is_dir( $theme_root . '/' . $dir . '/' . $sub_dir ) || '.' === $dir[0] || 'CVS' === $dir ) {
 530                          continue;
 531                      }
 532                      if ( ! file_exists( $theme_root . '/' . $dir . '/' . $sub_dir . '/style.css' ) ) {
 533                          continue;
 534                      }
 535                      $found_themes[ $dir . '/' . $sub_dir ] = array(
 536                          'theme_file' => $dir . '/' . $sub_dir . '/style.css',
 537                          'theme_root' => $theme_root,
 538                      );
 539                      $found_theme                           = true;
 540                  }
 541                  // Never mind the above, it's just a theme missing a style.css.
 542                  // Return it; WP_Theme will catch the error.
 543                  if ( ! $found_theme ) {
 544                      $found_themes[ $dir ] = array(
 545                          'theme_file' => $dir . '/style.css',
 546                          'theme_root' => $theme_root,
 547                      );
 548                  }
 549              }
 550          }
 551      }
 552  
 553      asort( $found_themes );
 554  
 555      $theme_roots          = array();
 556      $relative_theme_roots = array_flip( $relative_theme_roots );
 557  
 558      foreach ( $found_themes as $theme_dir => $theme_data ) {
 559          $theme_roots[ $theme_dir ] = $relative_theme_roots[ $theme_data['theme_root'] ]; // Convert absolute to relative.
 560      }
 561  
 562      if ( get_site_transient( 'theme_roots' ) != $theme_roots ) {
 563          set_site_transient( 'theme_roots', $theme_roots, $cache_expiration );
 564      }
 565  
 566      return $found_themes;
 567  }
 568  
 569  /**
 570   * Retrieves path to themes directory.
 571   *
 572   * Does not have trailing slash.
 573   *
 574   * @since 1.5.0
 575   *
 576   * @global array $wp_theme_directories
 577   *
 578   * @param string $stylesheet_or_template Optional. The stylesheet or template name of the theme.
 579   *                                       Default is to leverage the main theme root.
 580   * @return string Themes directory path.
 581   */
 582  function get_theme_root( $stylesheet_or_template = '' ) {
 583      global $wp_theme_directories;
 584  
 585      $theme_root = '';
 586  
 587      if ( $stylesheet_or_template ) {
 588          $theme_root = get_raw_theme_root( $stylesheet_or_template );
 589          if ( $theme_root ) {
 590              // Always prepend WP_CONTENT_DIR unless the root currently registered as a theme directory.
 591              // This gives relative theme roots the benefit of the doubt when things go haywire.
 592              if ( ! in_array( $theme_root, (array) $wp_theme_directories, true ) ) {
 593                  $theme_root = WP_CONTENT_DIR . $theme_root;
 594              }
 595          }
 596      }
 597  
 598      if ( ! $theme_root ) {
 599          $theme_root = WP_CONTENT_DIR . '/themes';
 600      }
 601  
 602      /**
 603       * Filters the absolute path to the themes directory.
 604       *
 605       * @since 1.5.0
 606       *
 607       * @param string $theme_root Absolute path to themes directory.
 608       */
 609      return apply_filters( 'theme_root', $theme_root );
 610  }
 611  
 612  /**
 613   * Retrieves URI for themes directory.
 614   *
 615   * Does not have trailing slash.
 616   *
 617   * @since 1.5.0
 618   *
 619   * @global array $wp_theme_directories
 620   *
 621   * @param string $stylesheet_or_template Optional. The stylesheet or template name of the theme.
 622   *                                       Default is to leverage the main theme root.
 623   * @param string $theme_root             Optional. The theme root for which calculations will be based,
 624   *                                       preventing the need for a get_raw_theme_root() call. Default empty.
 625   * @return string Themes directory URI.
 626   */
 627  function get_theme_root_uri( $stylesheet_or_template = '', $theme_root = '' ) {
 628      global $wp_theme_directories;
 629  
 630      if ( $stylesheet_or_template && ! $theme_root ) {
 631          $theme_root = get_raw_theme_root( $stylesheet_or_template );
 632      }
 633  
 634      if ( $stylesheet_or_template && $theme_root ) {
 635          if ( in_array( $theme_root, (array) $wp_theme_directories, true ) ) {
 636              // Absolute path. Make an educated guess. YMMV -- but note the filter below.
 637              if ( 0 === strpos( $theme_root, WP_CONTENT_DIR ) ) {
 638                  $theme_root_uri = content_url( str_replace( WP_CONTENT_DIR, '', $theme_root ) );
 639              } elseif ( 0 === strpos( $theme_root, ABSPATH ) ) {
 640                  $theme_root_uri = site_url( str_replace( ABSPATH, '', $theme_root ) );
 641              } elseif ( 0 === strpos( $theme_root, WP_PLUGIN_DIR ) || 0 === strpos( $theme_root, WPMU_PLUGIN_DIR ) ) {
 642                  $theme_root_uri = plugins_url( basename( $theme_root ), $theme_root );
 643              } else {
 644                  $theme_root_uri = $theme_root;
 645              }
 646          } else {
 647              $theme_root_uri = content_url( $theme_root );
 648          }
 649      } else {
 650          $theme_root_uri = content_url( 'themes' );
 651      }
 652  
 653      /**
 654       * Filters the URI for themes directory.
 655       *
 656       * @since 1.5.0
 657       *
 658       * @param string $theme_root_uri         The URI for themes directory.
 659       * @param string $siteurl                WordPress web address which is set in General Options.
 660       * @param string $stylesheet_or_template The stylesheet or template name of the theme.
 661       */
 662      return apply_filters( 'theme_root_uri', $theme_root_uri, get_option( 'siteurl' ), $stylesheet_or_template );
 663  }
 664  
 665  /**
 666   * Gets the raw theme root relative to the content directory with no filters applied.
 667   *
 668   * @since 3.1.0
 669   *
 670   * @global array $wp_theme_directories
 671   *
 672   * @param string $stylesheet_or_template The stylesheet or template name of the theme.
 673   * @param bool   $skip_cache             Optional. Whether to skip the cache.
 674   *                                       Defaults to false, meaning the cache is used.
 675   * @return string Theme root.
 676   */
 677  function get_raw_theme_root( $stylesheet_or_template, $skip_cache = false ) {
 678      global $wp_theme_directories;
 679  
 680      if ( ! is_array( $wp_theme_directories ) || count( $wp_theme_directories ) <= 1 ) {
 681          return '/themes';
 682      }
 683  
 684      $theme_root = false;
 685  
 686      // If requesting the root for the current theme, consult options to avoid calling get_theme_roots().
 687      if ( ! $skip_cache ) {
 688          if ( get_option( 'stylesheet' ) == $stylesheet_or_template ) {
 689              $theme_root = get_option( 'stylesheet_root' );
 690          } elseif ( get_option( 'template' ) == $stylesheet_or_template ) {
 691              $theme_root = get_option( 'template_root' );
 692          }
 693      }
 694  
 695      if ( empty( $theme_root ) ) {
 696          $theme_roots = get_theme_roots();
 697          if ( ! empty( $theme_roots[ $stylesheet_or_template ] ) ) {
 698              $theme_root = $theme_roots[ $stylesheet_or_template ];
 699          }
 700      }
 701  
 702      return $theme_root;
 703  }
 704  
 705  /**
 706   * Displays localized stylesheet link element.
 707   *
 708   * @since 2.1.0
 709   */
 710  function locale_stylesheet() {
 711      $stylesheet = get_locale_stylesheet_uri();
 712      if ( empty( $stylesheet ) ) {
 713          return;
 714      }
 715  
 716      $type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
 717  
 718      printf(
 719          '<link rel="stylesheet" href="%s"%s media="screen" />',
 720          $stylesheet,
 721          $type_attr
 722      );
 723  }
 724  
 725  /**
 726   * Switches the theme.
 727   *
 728   * Accepts one argument: $stylesheet of the theme. It also accepts an additional function signature
 729   * of two arguments: $template then $stylesheet. This is for backward compatibility.
 730   *
 731   * @since 2.5.0
 732   *
 733   * @global array                $wp_theme_directories
 734   * @global WP_Customize_Manager $wp_customize
 735   * @global array                $sidebars_widgets
 736   *
 737   * @param string $stylesheet Stylesheet name.
 738   */
 739  function switch_theme( $stylesheet ) {
 740      global $wp_theme_directories, $wp_customize, $sidebars_widgets;
 741  
 742      $requirements = validate_theme_requirements( $stylesheet );
 743      if ( is_wp_error( $requirements ) ) {
 744          wp_die( $requirements );
 745      }
 746  
 747      $_sidebars_widgets = null;
 748      if ( 'wp_ajax_customize_save' === current_action() ) {
 749          $old_sidebars_widgets_data_setting = $wp_customize->get_setting( 'old_sidebars_widgets_data' );
 750          if ( $old_sidebars_widgets_data_setting ) {
 751              $_sidebars_widgets = $wp_customize->post_value( $old_sidebars_widgets_data_setting );
 752          }
 753      } elseif ( is_array( $sidebars_widgets ) ) {
 754          $_sidebars_widgets = $sidebars_widgets;
 755      }
 756  
 757      if ( is_array( $_sidebars_widgets ) ) {
 758          set_theme_mod(
 759              'sidebars_widgets',
 760              array(
 761                  'time' => time(),
 762                  'data' => $_sidebars_widgets,
 763              )
 764          );
 765      }
 766  
 767      $nav_menu_locations = get_theme_mod( 'nav_menu_locations' );
 768      update_option( 'theme_switch_menu_locations', $nav_menu_locations );
 769  
 770      if ( func_num_args() > 1 ) {
 771          $stylesheet = func_get_arg( 1 );
 772      }
 773  
 774      $old_theme = wp_get_theme();
 775      $new_theme = wp_get_theme( $stylesheet );
 776      $template  = $new_theme->get_template();
 777  
 778      if ( wp_is_recovery_mode() ) {
 779          $paused_themes = wp_paused_themes();
 780          $paused_themes->delete( $old_theme->get_stylesheet() );
 781          $paused_themes->delete( $old_theme->get_template() );
 782      }
 783  
 784      update_option( 'template', $template );
 785      update_option( 'stylesheet', $stylesheet );
 786  
 787      if ( count( $wp_theme_directories ) > 1 ) {
 788          update_option( 'template_root', get_raw_theme_root( $template, true ) );
 789          update_option( 'stylesheet_root', get_raw_theme_root( $stylesheet, true ) );
 790      } else {
 791          delete_option( 'template_root' );
 792          delete_option( 'stylesheet_root' );
 793      }
 794  
 795      $new_name = $new_theme->get( 'Name' );
 796  
 797      update_option( 'current_theme', $new_name );
 798  
 799      // Migrate from the old mods_{name} option to theme_mods_{slug}.
 800      if ( is_admin() && false === get_option( 'theme_mods_' . $stylesheet ) ) {
 801          $default_theme_mods = (array) get_option( 'mods_' . $new_name );
 802          if ( ! empty( $nav_menu_locations ) && empty( $default_theme_mods['nav_menu_locations'] ) ) {
 803              $default_theme_mods['nav_menu_locations'] = $nav_menu_locations;
 804          }
 805          add_option( "theme_mods_$stylesheet", $default_theme_mods );
 806      } else {
 807          /*
 808           * Since retrieve_widgets() is called when initializing a theme in the Customizer,
 809           * we need to remove the theme mods to avoid overwriting changes made via
 810           * the Customizer when accessing wp-admin/widgets.php.
 811           */
 812          if ( 'wp_ajax_customize_save' === current_action() ) {
 813              remove_theme_mod( 'sidebars_widgets' );
 814          }
 815      }
 816  
 817      update_option( 'theme_switched', $old_theme->get_stylesheet() );
 818  
 819      /**
 820       * Fires after the theme is switched.
 821       *
 822       * @since 1.5.0
 823       * @since 4.5.0 Introduced the `$old_theme` parameter.
 824       *
 825       * @param string   $new_name  Name of the new theme.
 826       * @param WP_Theme $new_theme WP_Theme instance of the new theme.
 827       * @param WP_Theme $old_theme WP_Theme instance of the old theme.
 828       */
 829      do_action( 'switch_theme', $new_name, $new_theme, $old_theme );
 830  }
 831  
 832  /**
 833   * Checks that the current theme has 'index.php' and 'style.css' files.
 834   *
 835   * Does not initially check the default theme, which is the fallback and should always exist.
 836   * But if it doesn't exist, it'll fall back to the latest core default theme that does exist.
 837   * Will switch theme to the fallback theme if current theme does not validate.
 838   *
 839   * You can use the {@see 'validate_current_theme'} filter to return false to disable
 840   * this functionality.
 841   *
 842   * @since 1.5.0
 843   *
 844   * @see WP_DEFAULT_THEME
 845   *
 846   * @return bool
 847   */
 848  function validate_current_theme() {
 849      /**
 850       * Filters whether to validate the current theme.
 851       *
 852       * @since 2.7.0
 853       *
 854       * @param bool $validate Whether to validate the current theme. Default true.
 855       */
 856      if ( wp_installing() || ! apply_filters( 'validate_current_theme', true ) ) {
 857          return true;
 858      }
 859  
 860      if ( ! file_exists( get_template_directory() . '/index.php' ) ) {
 861          // Invalid.
 862      } elseif ( ! file_exists( get_template_directory() . '/style.css' ) ) {
 863          // Invalid.
 864      } elseif ( is_child_theme() && ! file_exists( get_stylesheet_directory() . '/style.css' ) ) {
 865          // Invalid.
 866      } else {
 867          // Valid.
 868          return true;
 869      }
 870  
 871      $default = wp_get_theme( WP_DEFAULT_THEME );
 872      if ( $default->exists() ) {
 873          switch_theme( WP_DEFAULT_THEME );
 874          return false;
 875      }
 876  
 877      /**
 878       * If we're in an invalid state but WP_DEFAULT_THEME doesn't exist,
 879       * switch to the latest core default theme that's installed.
 880       *
 881       * If it turns out that this latest core default theme is our current
 882       * theme, then there's nothing we can do about that, so we have to bail,
 883       * rather than going into an infinite loop. (This is why there are
 884       * checks against WP_DEFAULT_THEME above, also.) We also can't do anything
 885       * if it turns out there is no default theme installed. (That's `false`.)
 886       */
 887      $default = WP_Theme::get_core_default_theme();
 888      if ( false === $default || get_stylesheet() == $default->get_stylesheet() ) {
 889          return true;
 890      }
 891  
 892      switch_theme( $default->get_stylesheet() );
 893      return false;
 894  }
 895  
 896  /**
 897   * Validates the theme requirements for WordPress version and PHP version.
 898   *
 899   * Uses the information from `Requires at least` and `Requires PHP` headers
 900   * defined in the theme's `style.css` file.
 901   *
 902   * If the headers are not present in the theme's stylesheet file,
 903   * `readme.txt` is also checked as a fallback.
 904   *
 905   * @since 5.5.0
 906   *
 907   * @param string $stylesheet Directory name for the theme.
 908   * @return true|WP_Error True if requirements are met, WP_Error on failure.
 909   */
 910  function validate_theme_requirements( $stylesheet ) {
 911      $theme = wp_get_theme( $stylesheet );
 912  
 913      $requirements = array(
 914          'requires'     => ! empty( $theme->get( 'RequiresWP' ) ) ? $theme->get( 'RequiresWP' ) : '',
 915          'requires_php' => ! empty( $theme->get( 'RequiresPHP' ) ) ? $theme->get( 'RequiresPHP' ) : '',
 916      );
 917  
 918      $readme_file = $theme->theme_root . '/' . $stylesheet . '/readme.txt';
 919  
 920      if ( file_exists( $readme_file ) ) {
 921          $readme_headers = get_file_data(
 922              $readme_file,
 923              array(
 924                  'requires'     => 'Requires at least',
 925                  'requires_php' => 'Requires PHP',
 926              ),
 927              'theme'
 928          );
 929  
 930          $requirements = array_merge( $readme_headers, $requirements );
 931      }
 932  
 933      $compatible_wp  = is_wp_version_compatible( $requirements['requires'] );
 934      $compatible_php = is_php_version_compatible( $requirements['requires_php'] );
 935  
 936      if ( ! $compatible_wp && ! $compatible_php ) {
 937          return new WP_Error(
 938              'theme_wp_php_incompatible',
 939              sprintf(
 940                  /* translators: %s: Theme name. */
 941                  _x( '<strong>Error:</strong> Current WordPress and PHP versions do not meet minimum requirements for %s.', 'theme' ),
 942                  $theme->display( 'Name' )
 943              )
 944          );
 945      } elseif ( ! $compatible_php ) {
 946          return new WP_Error(
 947              'theme_php_incompatible',
 948              sprintf(
 949                  /* translators: %s: Theme name. */
 950                  _x( '<strong>Error:</strong> Current PHP version does not meet minimum requirements for %s.', 'theme' ),
 951                  $theme->display( 'Name' )
 952              )
 953          );
 954      } elseif ( ! $compatible_wp ) {
 955          return new WP_Error(
 956              'theme_wp_incompatible',
 957              sprintf(
 958                  /* translators: %s: Theme name. */
 959                  _x( '<strong>Error:</strong> Current WordPress version does not meet minimum requirements for %s.', 'theme' ),
 960                  $theme->display( 'Name' )
 961              )
 962          );
 963      }
 964  
 965      return true;
 966  }
 967  
 968  /**
 969   * Retrieves all theme modifications.
 970   *
 971   * @since 3.1.0
 972   *
 973   * @return array|void Theme modifications.
 974   */
 975  function get_theme_mods() {
 976      $theme_slug = get_option( 'stylesheet' );
 977      $mods       = get_option( "theme_mods_$theme_slug" );
 978      if ( false === $mods ) {
 979          $theme_name = get_option( 'current_theme' );
 980          if ( false === $theme_name ) {
 981              $theme_name = wp_get_theme()->get( 'Name' );
 982          }
 983          $mods = get_option( "mods_$theme_name" ); // Deprecated location.
 984          if ( is_admin() && false !== $mods ) {
 985              update_option( "theme_mods_$theme_slug", $mods );
 986              delete_option( "mods_$theme_name" );
 987          }
 988      }
 989      return $mods;
 990  }
 991  
 992  /**
 993   * Retrieves theme modification value for the current theme.
 994   *
 995   * If the modification name does not exist, then the $default will be passed
 996   * through {@link https://www.php.net/sprintf sprintf()} PHP function with
 997   * the template directory URI as the first string and the stylesheet directory URI
 998   * as the second string.
 999   *
1000   * @since 2.1.0
1001   *
1002   * @param string       $name    Theme modification name.
1003   * @param string|false $default Optional. Theme modification default value. Default false.
1004   * @return mixed Theme modification value.
1005   */
1006  function get_theme_mod( $name, $default = false ) {
1007      $mods = get_theme_mods();
1008  
1009      if ( isset( $mods[ $name ] ) ) {
1010          /**
1011           * Filters the theme modification, or 'theme_mod', value.
1012           *
1013           * The dynamic portion of the hook name, `$name`, refers to the key name
1014           * of the modification array. For example, 'header_textcolor', 'header_image',
1015           * and so on depending on the theme options.
1016           *
1017           * @since 2.2.0
1018           *
1019           * @param string $current_mod The value of the current theme modification.
1020           */
1021          return apply_filters( "theme_mod_{$name}", $mods[ $name ] );
1022      }
1023  
1024      if ( is_string( $default ) ) {
1025          // Only run the replacement if an sprintf() string format pattern was found.
1026          if ( preg_match( '#(?<!%)%(?:\d+\$?)?s#', $default ) ) {
1027              $default = sprintf( $default, get_template_directory_uri(), get_stylesheet_directory_uri() );
1028          }
1029      }
1030  
1031      /** This filter is documented in wp-includes/theme.php */
1032      return apply_filters( "theme_mod_{$name}", $default );
1033  }
1034  
1035  /**
1036   * Updates theme modification value for the current theme.
1037   *
1038   * @since 2.1.0
1039   *
1040   * @param string $name  Theme modification name.
1041   * @param mixed  $value Theme modification value.
1042   */
1043  function set_theme_mod( $name, $value ) {
1044      $mods      = get_theme_mods();
1045      $old_value = isset( $mods[ $name ] ) ? $mods[ $name ] : false;
1046  
1047      /**
1048       * Filters the theme modification, or 'theme_mod', value on save.
1049       *
1050       * The dynamic portion of the hook name, `$name`, refers to the key name
1051       * of the modification array. For example, 'header_textcolor', 'header_image',
1052       * and so on depending on the theme options.
1053       *
1054       * @since 3.9.0
1055       *
1056       * @param string $value     The new value of the theme modification.
1057       * @param string $old_value The current value of the theme modification.
1058       */
1059      $mods[ $name ] = apply_filters( "pre_set_theme_mod_{$name}", $value, $old_value );
1060  
1061      $theme = get_option( 'stylesheet' );
1062      update_option( "theme_mods_$theme", $mods );
1063  }
1064  
1065  /**
1066   * Removes theme modification name from current theme list.
1067   *
1068   * If removing the name also removes all elements, then the entire option
1069   * will be removed.
1070   *
1071   * @since 2.1.0
1072   *
1073   * @param string $name Theme modification name.
1074   */
1075  function remove_theme_mod( $name ) {
1076      $mods = get_theme_mods();
1077  
1078      if ( ! isset( $mods[ $name ] ) ) {
1079          return;
1080      }
1081  
1082      unset( $mods[ $name ] );
1083  
1084      if ( empty( $mods ) ) {
1085          remove_theme_mods();
1086          return;
1087      }
1088      $theme = get_option( 'stylesheet' );
1089      update_option( "theme_mods_$theme", $mods );
1090  }
1091  
1092  /**
1093   * Removes theme modifications option for current theme.
1094   *
1095   * @since 2.1.0
1096   */
1097  function remove_theme_mods() {
1098      delete_option( 'theme_mods_' . get_option( 'stylesheet' ) );
1099  
1100      // Old style.
1101      $theme_name = get_option( 'current_theme' );
1102      if ( false === $theme_name ) {
1103          $theme_name = wp_get_theme()->get( 'Name' );
1104      }
1105      delete_option( 'mods_' . $theme_name );
1106  }
1107  
1108  /**
1109   * Retrieves the custom header text color in 3- or 6-digit hexadecimal form.
1110   *
1111   * @since 2.1.0
1112   *
1113   * @return string Header text color in 3- or 6-digit hexadecimal form (minus the hash symbol).
1114   */
1115  function get_header_textcolor() {
1116      return get_theme_mod( 'header_textcolor', get_theme_support( 'custom-header', 'default-text-color' ) );
1117  }
1118  
1119  /**
1120   * Displays the custom header text color in 3- or 6-digit hexadecimal form (minus the hash symbol).
1121   *
1122   * @since 2.1.0
1123   */
1124  function header_textcolor() {
1125      echo get_header_textcolor();
1126  }
1127  
1128  /**
1129   * Whether to display the header text.
1130   *
1131   * @since 3.4.0
1132   *
1133   * @return bool
1134   */
1135  function display_header_text() {
1136      if ( ! current_theme_supports( 'custom-header', 'header-text' ) ) {
1137          return false;
1138      }
1139  
1140      $text_color = get_theme_mod( 'header_textcolor', get_theme_support( 'custom-header', 'default-text-color' ) );
1141      return 'blank' !== $text_color;
1142  }
1143  
1144  /**
1145   * Checks whether a header image is set or not.
1146   *
1147   * @since 4.2.0
1148   *
1149   * @see get_header_image()
1150   *
1151   * @return bool Whether a header image is set or not.
1152   */
1153  function has_header_image() {
1154      return (bool) get_header_image();
1155  }
1156  
1157  /**
1158   * Retrieves header image for custom header.
1159   *
1160   * @since 2.1.0
1161   *
1162   * @return string|false
1163   */
1164  function get_header_image() {
1165      $url = get_theme_mod( 'header_image', get_theme_support( 'custom-header', 'default-image' ) );
1166  
1167      if ( 'remove-header' === $url ) {
1168          return false;
1169      }
1170  
1171      if ( is_random_header_image() ) {
1172          $url = get_random_header_image();
1173      }
1174  
1175      return esc_url_raw( set_url_scheme( $url ) );
1176  }
1177  
1178  /**
1179   * Creates image tag markup for a custom header image.
1180   *
1181   * @since 4.4.0
1182   *
1183   * @param array $attr Optional. Additional attributes for the image tag. Can be used
1184   *                              to override the default attributes. Default empty.
1185   * @return string HTML image element markup or empty string on failure.
1186   */
1187  function get_header_image_tag( $attr = array() ) {
1188      $header      = get_custom_header();
1189      $header->url = get_header_image();
1190  
1191      if ( ! $header->url ) {
1192          return '';
1193      }
1194  
1195      $width  = absint( $header->width );
1196      $height = absint( $header->height );
1197  
1198      $attr = wp_parse_args(
1199          $attr,
1200          array(
1201              'src'    => $header->url,
1202              'width'  => $width,
1203              'height' => $height,
1204              'alt'    => get_bloginfo( 'name' ),
1205          )
1206      );
1207  
1208      // Generate 'srcset' and 'sizes' if not already present.
1209      if ( empty( $attr['srcset'] ) && ! empty( $header->attachment_id ) ) {
1210          $image_meta = get_post_meta( $header->attachment_id, '_wp_attachment_metadata', true );
1211          $size_array = array( $width, $height );
1212  
1213          if ( is_array( $image_meta ) ) {
1214              $srcset = wp_calculate_image_srcset( $size_array, $header->url, $image_meta, $header->attachment_id );
1215              $sizes  = ! empty( $attr['sizes'] ) ? $attr['sizes'] : wp_calculate_image_sizes( $size_array, $header->url, $image_meta, $header->attachment_id );
1216  
1217              if ( $srcset && $sizes ) {
1218                  $attr['srcset'] = $srcset;
1219                  $attr['sizes']  = $sizes;
1220              }
1221          }
1222      }
1223  
1224      $attr = array_map( 'esc_attr', $attr );
1225      $html = '<img';
1226  
1227      foreach ( $attr as $name => $value ) {
1228          $html .= ' ' . $name . '="' . $value . '"';
1229      }
1230  
1231      $html .= ' />';
1232  
1233      /**
1234       * Filters the markup of header images.
1235       *
1236       * @since 4.4.0
1237       *
1238       * @param string $html   The HTML image tag markup being filtered.
1239       * @param object $header The custom header object returned by 'get_custom_header()'.
1240       * @param array  $attr   Array of the attributes for the image tag.
1241       */
1242      return apply_filters( 'get_header_image_tag', $html, $header, $attr );
1243  }
1244  
1245  /**
1246   * Displays the image markup for a custom header image.
1247   *
1248   * @since 4.4.0
1249   *
1250   * @param array $attr Optional. Attributes for the image markup. Default empty.
1251   */
1252  function the_header_image_tag( $attr = array() ) {
1253      echo get_header_image_tag( $attr );
1254  }
1255  
1256  /**
1257   * Gets random header image data from registered images in theme.
1258   *
1259   * @since 3.4.0
1260   *
1261   * @access private
1262   *
1263   * @global array $_wp_default_headers
1264   *
1265   * @return object
1266   */
1267  function _get_random_header_data() {
1268      static $_wp_random_header = null;
1269  
1270      if ( empty( $_wp_random_header ) ) {
1271          global $_wp_default_headers;
1272          $header_image_mod = get_theme_mod( 'header_image', '' );
1273          $headers          = array();
1274  
1275          if ( 'random-uploaded-image' === $header_image_mod ) {
1276              $headers = get_uploaded_header_images();
1277          } elseif ( ! empty( $_wp_default_headers ) ) {
1278              if ( 'random-default-image' === $header_image_mod ) {
1279                  $headers = $_wp_default_headers;
1280              } else {
1281                  if ( current_theme_supports( 'custom-header', 'random-default' ) ) {
1282                      $headers = $_wp_default_headers;
1283                  }
1284              }
1285          }
1286  
1287          if ( empty( $headers ) ) {
1288              return new stdClass;
1289          }
1290  
1291          $_wp_random_header = (object) $headers[ array_rand( $headers ) ];
1292  
1293          $_wp_random_header->url           = sprintf( $_wp_random_header->url, get_template_directory_uri(), get_stylesheet_directory_uri() );
1294          $_wp_random_header->thumbnail_url = sprintf( $_wp_random_header->thumbnail_url, get_template_directory_uri(), get_stylesheet_directory_uri() );
1295      }
1296  
1297      return $_wp_random_header;
1298  }
1299  
1300  /**
1301   * Gets random header image URL from registered images in theme.
1302   *
1303   * @since 3.2.0
1304   *
1305   * @return string Path to header image.
1306   */
1307  function get_random_header_image() {
1308      $random_image = _get_random_header_data();
1309  
1310      if ( empty( $random_image->url ) ) {
1311          return '';
1312      }
1313  
1314      return $random_image->url;
1315  }
1316  
1317  /**
1318   * Checks if random header image is in use.
1319   *
1320   * Always true if user expressly chooses the option in Appearance > Header.
1321   * Also true if theme has multiple header images registered, no specific header image
1322   * is chosen, and theme turns on random headers with add_theme_support().
1323   *
1324   * @since 3.2.0
1325   *
1326   * @param string $type The random pool to use. Possible values include 'any',
1327   *                     'default', 'uploaded'. Default 'any'.
1328   * @return bool
1329   */
1330  function is_random_header_image( $type = 'any' ) {
1331      $header_image_mod = get_theme_mod( 'header_image', get_theme_support( 'custom-header', 'default-image' ) );
1332  
1333      if ( 'any' === $type ) {
1334          if ( 'random-default-image' === $header_image_mod
1335              || 'random-uploaded-image' === $header_image_mod
1336              || ( '' !== get_random_header_image() && empty( $header_image_mod ) )
1337          ) {
1338              return true;
1339          }
1340      } else {
1341          if ( "random-$type-image" === $header_image_mod ) {
1342              return true;
1343          } elseif ( 'default' === $type && empty( $header_image_mod ) && '' !== get_random_header_image() ) {
1344              return true;
1345          }
1346      }
1347  
1348      return false;
1349  }
1350  
1351  /**
1352   * Displays header image URL.
1353   *
1354   * @since 2.1.0
1355   */
1356  function header_image() {
1357      $image = get_header_image();
1358  
1359      if ( $image ) {
1360          echo esc_url( $image );
1361      }
1362  }
1363  
1364  /**
1365   * Gets the header images uploaded for the current theme.
1366   *
1367   * @since 3.2.0
1368   *
1369   * @return array
1370   */
1371  function get_uploaded_header_images() {
1372      $header_images = array();
1373  
1374      // @todo Caching.
1375      $headers = get_posts(
1376          array(
1377              'post_type'  => 'attachment',
1378              'meta_key'   => '_wp_attachment_is_custom_header',
1379              'meta_value' => get_option( 'stylesheet' ),
1380              'orderby'    => 'none',
1381              'nopaging'   => true,
1382          )
1383      );
1384  
1385      if ( empty( $headers ) ) {
1386          return array();
1387      }
1388  
1389      foreach ( (array) $headers as $header ) {
1390          $url          = esc_url_raw( wp_get_attachment_url( $header->ID ) );
1391          $header_data  = wp_get_attachment_metadata( $header->ID );
1392          $header_index = $header->ID;
1393  
1394          $header_images[ $header_index ]                      = array();
1395          $header_images[ $header_index ]['attachment_id']     = $header->ID;
1396          $header_images[ $header_index ]['url']               = $url;
1397          $header_images[ $header_index ]['thumbnail_url']     = $url;
1398          $header_images[ $header_index ]['alt_text']          = get_post_meta( $header->ID, '_wp_attachment_image_alt', true );
1399          $header_images[ $header_index ]['attachment_parent'] = isset( $header_data['attachment_parent'] ) ? $header_data['attachment_parent'] : '';
1400  
1401          if ( isset( $header_data['width'] ) ) {
1402              $header_images[ $header_index ]['width'] = $header_data['width'];
1403          }
1404          if ( isset( $header_data['height'] ) ) {
1405              $header_images[ $header_index ]['height'] = $header_data['height'];
1406          }
1407      }
1408  
1409      return $header_images;
1410  }
1411  
1412  /**
1413   * Gets the header image data.
1414   *
1415   * @since 3.4.0
1416   *
1417   * @global array $_wp_default_headers
1418   *
1419   * @return object
1420   */
1421  function get_custom_header() {
1422      global $_wp_default_headers;
1423  
1424      if ( is_random_header_image() ) {
1425          $data = _get_random_header_data();
1426      } else {
1427          $data = get_theme_mod( 'header_image_data' );
1428          if ( ! $data && current_theme_supports( 'custom-header', 'default-image' ) ) {
1429              $directory_args        = array( get_template_directory_uri(), get_stylesheet_directory_uri() );
1430              $data                  = array();
1431              $data['url']           = vsprintf( get_theme_support( 'custom-header', 'default-image' ), $directory_args );
1432              $data['thumbnail_url'] = $data['url'];
1433              if ( ! empty( $_wp_default_headers ) ) {
1434                  foreach ( (array) $_wp_default_headers as $default_header ) {
1435                      $url = vsprintf( $default_header['url'], $directory_args );
1436                      if ( $data['url'] == $url ) {
1437                          $data                  = $default_header;
1438                          $data['url']           = $url;
1439                          $data['thumbnail_url'] = vsprintf( $data['thumbnail_url'], $directory_args );
1440                          break;
1441                      }
1442                  }
1443              }
1444          }
1445      }
1446  
1447      $default = array(
1448          'url'           => '',
1449          'thumbnail_url' => '',
1450          'width'         => get_theme_support( 'custom-header', 'width' ),
1451          'height'        => get_theme_support( 'custom-header', 'height' ),
1452          'video'         => get_theme_support( 'custom-header', 'video' ),
1453      );
1454      return (object) wp_parse_args( $data, $default );
1455  }
1456  
1457  /**
1458   * Registers a selection of default headers to be displayed by the custom header admin UI.
1459   *
1460   * @since 3.0.0
1461   *
1462   * @global array $_wp_default_headers
1463   *
1464   * @param array $headers Array of headers keyed by a string ID. The IDs point to arrays
1465   *                       containing 'url', 'thumbnail_url', and 'description' keys.
1466   */
1467  function register_default_headers( $headers ) {
1468      global $_wp_default_headers;
1469  
1470      $_wp_default_headers = array_merge( (array) $_wp_default_headers, (array) $headers );
1471  }
1472  
1473  /**
1474   * Unregisters default headers.
1475   *
1476   * This function must be called after register_default_headers() has already added the
1477   * header you want to remove.
1478   *
1479   * @see register_default_headers()
1480   * @since 3.0.0
1481   *
1482   * @global array $_wp_default_headers
1483   *
1484   * @param string|array $header The header string id (key of array) to remove, or an array thereof.
1485   * @return bool|void A single header returns true on success, false on failure.
1486   *                   There is currently no return value for multiple headers.
1487   */
1488  function unregister_default_headers( $header ) {
1489      global $_wp_default_headers;
1490      if ( is_array( $header ) ) {
1491          array_map( 'unregister_default_headers', $header );
1492      } elseif ( isset( $_wp_default_headers[ $header ] ) ) {
1493          unset( $_wp_default_headers[ $header ] );
1494          return true;
1495      } else {
1496          return false;
1497      }
1498  }
1499  
1500  /**
1501   * Checks whether a header video is set or not.
1502   *
1503   * @since 4.7.0
1504   *
1505   * @see get_header_video_url()
1506   *
1507   * @return bool Whether a header video is set or not.
1508   */
1509  function has_header_video() {
1510      return (bool) get_header_video_url();
1511  }
1512  
1513  /**
1514   * Retrieves header video URL for custom header.
1515   *
1516   * Uses a local video if present, or falls back to an external video.
1517   *
1518   * @since 4.7.0
1519   *
1520   * @return string|false Header video URL or false if there is no video.
1521   */
1522  function get_header_video_url() {
1523      $id = absint( get_theme_mod( 'header_video' ) );
1524  
1525      if ( $id ) {
1526          // Get the file URL from the attachment ID.
1527          $url = wp_get_attachment_url( $id );
1528      } else {
1529          $url = get_theme_mod( 'external_header_video' );
1530      }
1531  
1532      /**
1533       * Filters the header video URL.
1534       *
1535       * @since 4.7.3
1536       *
1537       * @param string $url Header video URL, if available.
1538       */
1539      $url = apply_filters( 'get_header_video_url', $url );
1540  
1541      if ( ! $id && ! $url ) {
1542          return false;
1543      }
1544  
1545      return esc_url_raw( set_url_scheme( $url ) );
1546  }
1547  
1548  /**
1549   * Displays header video URL.
1550   *
1551   * @since 4.7.0
1552   */
1553  function the_header_video_url() {
1554      $video = get_header_video_url();
1555  
1556      if ( $video ) {
1557          echo esc_url( $video );
1558      }
1559  }
1560  
1561  /**
1562   * Retrieves header video settings.
1563   *
1564   * @since 4.7.0
1565   *
1566   * @return array
1567   */
1568  function get_header_video_settings() {
1569      $header     = get_custom_header();
1570      $video_url  = get_header_video_url();
1571      $video_type = wp_check_filetype( $video_url, wp_get_mime_types() );
1572  
1573      $settings = array(
1574          'mimeType'  => '',
1575          'posterUrl' => get_header_image(),
1576          'videoUrl'  => $video_url,
1577          'width'     => absint( $header->width ),
1578          'height'    => absint( $header->height ),
1579          'minWidth'  => 900,
1580          'minHeight' => 500,
1581          'l10n'      => array(
1582              'pause'      => __( 'Pause' ),
1583              'play'       => __( 'Play' ),
1584              'pauseSpeak' => __( 'Video is paused.' ),
1585              'playSpeak'  => __( 'Video is playing.' ),
1586          ),
1587      );
1588  
1589      if ( preg_match( '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#', $video_url ) ) {
1590          $settings['mimeType'] = 'video/x-youtube';
1591      } elseif ( ! empty( $video_type['type'] ) ) {
1592          $settings['mimeType'] = $video_type['type'];
1593      }
1594  
1595      /**
1596       * Filters header video settings.
1597       *
1598       * @since 4.7.0
1599       *
1600       * @param array $settings An array of header video settings.
1601       */
1602      return apply_filters( 'header_video_settings', $settings );
1603  }
1604  
1605  /**
1606   * Checks whether a custom header is set or not.
1607   *
1608   * @since 4.7.0
1609   *
1610   * @return bool True if a custom header is set. False if not.
1611   */
1612  function has_custom_header() {
1613      if ( has_header_image() || ( has_header_video() && is_header_video_active() ) ) {
1614          return true;
1615      }
1616  
1617      return false;
1618  }
1619  
1620  /**
1621   * Checks whether the custom header video is eligible to show on the current page.
1622   *
1623   * @since 4.7.0
1624   *
1625   * @return bool True if the custom header video should be shown. False if not.
1626   */
1627  function is_header_video_active() {
1628      if ( ! get_theme_support( 'custom-header', 'video' ) ) {
1629          return false;
1630      }
1631  
1632      $video_active_cb = get_theme_support( 'custom-header', 'video-active-callback' );
1633  
1634      if ( empty( $video_active_cb ) || ! is_callable( $video_active_cb ) ) {
1635          $show_video = true;
1636      } else {
1637          $show_video = call_user_func( $video_active_cb );
1638      }
1639  
1640      /**
1641       * Filters whether the custom header video is eligible to show on the current page.
1642       *
1643       * @since 4.7.0
1644       *
1645       * @param bool $show_video Whether the custom header video should be shown. Returns the value
1646       *                         of the theme setting for the `custom-header`'s `video-active-callback`.
1647       *                         If no callback is set, the default value is that of `is_front_page()`.
1648       */
1649      return apply_filters( 'is_header_video_active', $show_video );
1650  }
1651  
1652  /**
1653   * Retrieves the markup for a custom header.
1654   *
1655   * The container div will always be returned in the Customizer preview.
1656   *
1657   * @since 4.7.0
1658   *
1659   * @return string The markup for a custom header on success.
1660   */
1661  function get_custom_header_markup() {
1662      if ( ! has_custom_header() && ! is_customize_preview() ) {
1663          return '';
1664      }
1665  
1666      return sprintf(
1667          '<div id="wp-custom-header" class="wp-custom-header">%s</div>',
1668          get_header_image_tag()
1669      );
1670  }
1671  
1672  /**
1673   * Prints the markup for a custom header.
1674   *
1675   * A container div will always be printed in the Customizer preview.
1676   *
1677   * @since 4.7.0
1678   */
1679  function the_custom_header_markup() {
1680      $custom_header = get_custom_header_markup();
1681      if ( empty( $custom_header ) ) {
1682          return;
1683      }
1684  
1685      echo $custom_header;
1686  
1687      if ( is_header_video_active() && ( has_header_video() || is_customize_preview() ) ) {
1688          wp_enqueue_script( 'wp-custom-header' );
1689          wp_localize_script( 'wp-custom-header', '_wpCustomHeaderSettings', get_header_video_settings() );
1690      }
1691  }
1692  
1693  /**
1694   * Retrieves background image for custom background.
1695   *
1696   * @since 3.0.0
1697   *
1698   * @return string
1699   */
1700  function get_background_image() {
1701      return get_theme_mod( 'background_image', get_theme_support( 'custom-background', 'default-image' ) );
1702  }
1703  
1704  /**
1705   * Displays background image path.
1706   *
1707   * @since 3.0.0
1708   */
1709  function background_image() {
1710      echo get_background_image();
1711  }
1712  
1713  /**
1714   * Retrieves value for custom background color.
1715   *
1716   * @since 3.0.0
1717   *
1718   * @return string
1719   */
1720  function get_background_color() {
1721      return get_theme_mod( 'background_color', get_theme_support( 'custom-background', 'default-color' ) );
1722  }
1723  
1724  /**
1725   * Displays background color value.
1726   *
1727   * @since 3.0.0
1728   */
1729  function background_color() {
1730      echo get_background_color();
1731  }
1732  
1733  /**
1734   * Default custom background callback.
1735   *
1736   * @since 3.0.0
1737   */
1738  function _custom_background_cb() {
1739      // $background is the saved custom image, or the default image.
1740      $background = set_url_scheme( get_background_image() );
1741  
1742      // $color is the saved custom color.
1743      // A default has to be specified in style.css. It will not be printed here.
1744      $color = get_background_color();
1745  
1746      if ( get_theme_support( 'custom-background', 'default-color' ) === $color ) {
1747          $color = false;
1748      }
1749  
1750      $type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
1751  
1752      if ( ! $background && ! $color ) {
1753          if ( is_customize_preview() ) {
1754              printf( '<style%s id="custom-background-css"></style>', $type_attr );
1755          }
1756          return;
1757      }
1758  
1759      $style = $color ? "background-color: #$color;" : '';
1760  
1761      if ( $background ) {
1762          $image = ' background-image: url("' . esc_url_raw( $background ) . '");';
1763  
1764          // Background Position.
1765          $position_x = get_theme_mod( 'background_position_x', get_theme_support( 'custom-background', 'default-position-x' ) );
1766          $position_y = get_theme_mod( 'background_position_y', get_theme_support( 'custom-background', 'default-position-y' ) );
1767  
1768          if ( ! in_array( $position_x, array( 'left', 'center', 'right' ), true ) ) {
1769              $position_x = 'left';
1770          }
1771  
1772          if ( ! in_array( $position_y, array( 'top', 'center', 'bottom' ), true ) ) {
1773              $position_y = 'top';
1774          }
1775  
1776          $position = " background-position: $position_x $position_y;";
1777  
1778          // Background Size.
1779          $size = get_theme_mod( 'background_size', get_theme_support( 'custom-background', 'default-size' ) );
1780  
1781          if ( ! in_array( $size, array( 'auto', 'contain', 'cover' ), true ) ) {
1782              $size = 'auto';
1783          }
1784  
1785          $size = " background-size: $size;";
1786  
1787          // Background Repeat.
1788          $repeat = get_theme_mod( 'background_repeat', get_theme_support( 'custom-background', 'default-repeat' ) );
1789  
1790          if ( ! in_array( $repeat, array( 'repeat-x', 'repeat-y', 'repeat', 'no-repeat' ), true ) ) {
1791              $repeat = 'repeat';
1792          }
1793  
1794          $repeat = " background-repeat: $repeat;";
1795  
1796          // Background Scroll.
1797          $attachment = get_theme_mod( 'background_attachment', get_theme_support( 'custom-background', 'default-attachment' ) );
1798  
1799          if ( 'fixed' !== $attachment ) {
1800              $attachment = 'scroll';
1801          }
1802  
1803          $attachment = " background-attachment: $attachment;";
1804  
1805          $style .= $image . $position . $size . $repeat . $attachment;
1806      }
1807      ?>
1808  <style<?php echo $type_attr; ?> id="custom-background-css">
1809  body.custom-background { <?php echo trim( $style ); ?> }
1810  </style>
1811      <?php
1812  }
1813  
1814  /**
1815   * Renders the Custom CSS style element.
1816   *
1817   * @since 4.7.0
1818   */
1819  function wp_custom_css_cb() {
1820      $styles = wp_get_custom_css();
1821      if ( $styles || is_customize_preview() ) :
1822          $type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
1823          ?>
1824          <style<?php echo $type_attr; ?> id="wp-custom-css">
1825              <?php echo strip_tags( $styles ); // Note that esc_html() cannot be used because `div &gt; span` is not interpreted properly. ?>
1826          </style>
1827          <?php
1828      endif;
1829  }
1830  
1831  /**
1832   * Fetches the `custom_css` post for a given theme.
1833   *
1834   * @since 4.7.0
1835   *
1836   * @param string $stylesheet Optional. A theme object stylesheet name. Defaults to the current theme.
1837   * @return WP_Post|null The custom_css post or null if none exists.
1838   */
1839  function wp_get_custom_css_post( $stylesheet = '' ) {
1840      if ( empty( $stylesheet ) ) {
1841          $stylesheet = get_stylesheet();
1842      }
1843  
1844      $custom_css_query_vars = array(
1845          'post_type'              => 'custom_css',
1846          'post_status'            => get_post_stati(),
1847          'name'                   => sanitize_title( $stylesheet ),
1848          'posts_per_page'         => 1,
1849          'no_found_rows'          => true,
1850          'cache_results'          => true,
1851          'update_post_meta_cache' => false,
1852          'update_post_term_cache' => false,
1853          'lazy_load_term_meta'    => false,
1854      );
1855  
1856      $post = null;
1857      if ( get_stylesheet() === $stylesheet ) {
1858          $post_id = get_theme_mod( 'custom_css_post_id' );
1859  
1860          if ( $post_id > 0 && get_post( $post_id ) ) {
1861              $post = get_post( $post_id );
1862          }
1863  
1864          // `-1` indicates no post exists; no query necessary.
1865          if ( ! $post && -1 !== $post_id ) {
1866              $query = new WP_Query( $custom_css_query_vars );
1867              $post  = $query->post;
1868              /*
1869               * Cache the lookup. See wp_update_custom_css_post().
1870               * @todo This should get cleared if a custom_css post is added/removed.
1871               */
1872              set_theme_mod( 'custom_css_post_id', $post ? $post->ID : -1 );
1873          }
1874      } else {
1875          $query = new WP_Query( $custom_css_query_vars );
1876          $post  = $query->post;
1877      }
1878  
1879      return $post;
1880  }
1881  
1882  /**
1883   * Fetches the saved Custom CSS content for rendering.
1884   *
1885   * @since 4.7.0
1886   *
1887   * @param string $stylesheet Optional. A theme object stylesheet name. Defaults to the current theme.
1888   * @return string The Custom CSS Post content.
1889   */
1890  function wp_get_custom_css( $stylesheet = '' ) {
1891      $css = '';
1892  
1893      if ( empty( $stylesheet ) ) {
1894          $stylesheet = get_stylesheet();
1895      }
1896  
1897      $post = wp_get_custom_css_post( $stylesheet );
1898      if ( $post ) {
1899          $css = $post->post_content;
1900      }
1901  
1902      /**
1903       * Filters the Custom CSS Output into the <head>.
1904       *
1905       * @since 4.7.0
1906       *
1907       * @param string $css        CSS pulled in from the Custom CSS CPT.
1908       * @param string $stylesheet The theme stylesheet name.
1909       */
1910      $css = apply_filters( 'wp_get_custom_css', $css, $stylesheet );
1911  
1912      return $css;
1913  }
1914  
1915  /**
1916   * Updates the `custom_css` post for a given theme.
1917   *
1918   * Inserts a `custom_css` post when one doesn't yet exist.
1919   *
1920   * @since 4.7.0
1921   *
1922   * @param string $css CSS, stored in `post_content`.
1923   * @param array  $args {
1924   *     Args.
1925   *
1926   *     @type string $preprocessed Pre-processed CSS, stored in `post_content_filtered`. Normally empty string. Optional.
1927   *     @type string $stylesheet   Stylesheet (child theme) to update. Optional, defaults to current theme/stylesheet.
1928   * }
1929   * @return WP_Post|WP_Error Post on success, error on failure.
1930   */
1931  function wp_update_custom_css_post( $css, $args = array() ) {
1932      $args = wp_parse_args(
1933          $args,
1934          array(
1935              'preprocessed' => '',
1936              'stylesheet'   => get_stylesheet(),
1937          )
1938      );
1939  
1940      $data = array(
1941          'css'          => $css,
1942          'preprocessed' => $args['preprocessed'],
1943      );
1944  
1945      /**
1946       * Filters the `css` (`post_content`) and `preprocessed` (`post_content_filtered`) args for a `custom_css` post being updated.
1947       *
1948       * This filter can be used by plugin that offer CSS pre-processors, to store the original
1949       * pre-processed CSS in `post_content_filtered` and then store processed CSS in `post_content`.
1950       * When used in this way, the `post_content_filtered` should be supplied as the setting value
1951       * instead of `post_content` via a the `customize_value_custom_css` filter, for example:
1952       *
1953       * <code>
1954       * add_filter( 'customize_value_custom_css', function( $value, $setting ) {
1955       *     $post = wp_get_custom_css_post( $setting->stylesheet );
1956       *     if ( $post && ! empty( $post->post_content_filtered ) ) {
1957       *         $css = $post->post_content_filtered;
1958       *     }
1959       *     return $css;
1960       * }, 10, 2 );
1961       * </code>
1962       *
1963       * @since 4.7.0
1964       * @param array $data {
1965       *     Custom CSS data.
1966       *
1967       *     @type string $css          CSS stored in `post_content`.
1968       *     @type string $preprocessed Pre-processed CSS stored in `post_content_filtered`. Normally empty string.
1969       * }
1970       * @param array $args {
1971       *     The args passed into `wp_update_custom_css_post()` merged with defaults.
1972       *
1973       *     @type string $css          The original CSS passed in to be updated.
1974       *     @type string $preprocessed The original preprocessed CSS passed in to be updated.
1975       *     @type string $stylesheet   The stylesheet (theme) being updated.
1976       * }
1977       */
1978      $data = apply_filters( 'update_custom_css_data', $data, array_merge( $args, compact( 'css' ) ) );
1979  
1980      $post_data = array(
1981          'post_title'            => $args['stylesheet'],
1982          'post_name'             => sanitize_title( $args['stylesheet'] ),
1983          'post_type'             => 'custom_css',
1984          'post_status'           => 'publish',
1985          'post_content'          => $data['css'],
1986          'post_content_filtered' => $data['preprocessed'],
1987      );
1988  
1989      // Update post if it already exists, otherwise create a new one.
1990      $post = wp_get_custom_css_post( $args['stylesheet'] );
1991      if ( $post ) {
1992          $post_data['ID'] = $post->ID;
1993          $r               = wp_update_post( wp_slash( $post_data ), true );
1994      } else {
1995          $r = wp_insert_post( wp_slash( $post_data ), true );
1996  
1997          if ( ! is_wp_error( $r ) ) {
1998              if ( get_stylesheet() === $args['stylesheet'] ) {
1999                  set_theme_mod( 'custom_css_post_id', $r );
2000              }
2001  
2002              // Trigger creation of a revision. This should be removed once #30854 is resolved.
2003              if ( 0 === count( wp_get_post_revisions( $r ) ) ) {
2004                  wp_save_post_revision( $r );
2005              }
2006          }
2007      }
2008  
2009      if ( is_wp_error( $r ) ) {
2010          return $r;
2011      }
2012      return get_post( $r );
2013  }
2014  
2015  /**
2016   * Adds callback for custom TinyMCE editor stylesheets.
2017   *
2018   * The parameter $stylesheet is the name of the stylesheet, relative to
2019   * the theme root. It also accepts an array of stylesheets.
2020   * It is optional and defaults to 'editor-style.css'.
2021   *
2022   * This function automatically adds another stylesheet with -rtl prefix, e.g. editor-style-rtl.css.
2023   * If that file doesn't exist, it is removed before adding the stylesheet(s) to TinyMCE.
2024   * If an array of stylesheets is passed to add_editor_style(),
2025   * RTL is only added for the first stylesheet.
2026   *
2027   * Since version 3.4 the TinyMCE body has .rtl CSS class.
2028   * It is a better option to use that class and add any RTL styles to the main stylesheet.
2029   *
2030   * @since 3.0.0
2031   *
2032   * @global array $editor_styles
2033   *
2034   * @param array|string $stylesheet Optional. Stylesheet name or array thereof, relative to theme root.
2035   *                                 Defaults to 'editor-style.css'
2036   */
2037  function add_editor_style( $stylesheet = 'editor-style.css' ) {
2038      global $editor_styles;
2039  
2040      add_theme_support( 'editor-style' );
2041  
2042      $editor_styles = (array) $editor_styles;
2043      $stylesheet    = (array) $stylesheet;
2044  
2045      if ( is_rtl() ) {
2046          $rtl_stylesheet = str_replace( '.css', '-rtl.css', $stylesheet[0] );
2047          $stylesheet[]   = $rtl_stylesheet;
2048      }
2049  
2050      $editor_styles = array_merge( $editor_styles, $stylesheet );
2051  }
2052  
2053  /**
2054   * Removes all visual editor stylesheets.
2055   *
2056   * @since 3.1.0
2057   *
2058   * @global array $editor_styles
2059   *
2060   * @return bool True on success, false if there were no stylesheets to remove.
2061   */
2062  function remove_editor_styles() {
2063      if ( ! current_theme_supports( 'editor-style' ) ) {
2064          return false;
2065      }
2066      _remove_theme_support( 'editor-style' );
2067      if ( is_admin() ) {
2068          $GLOBALS['editor_styles'] = array();
2069      }
2070      return true;
2071  }
2072  
2073  /**
2074   * Retrieves any registered editor stylesheet URLs.
2075   *
2076   * @since 4.0.0
2077   *
2078   * @global array $editor_styles Registered editor stylesheets
2079   *
2080   * @return string[] If registered, a list of editor stylesheet URLs.
2081   */
2082  function get_editor_stylesheets() {
2083      $stylesheets = array();
2084      // Load editor_style.css if the current theme supports it.
2085      if ( ! empty( $GLOBALS['editor_styles'] ) && is_array( $GLOBALS['editor_styles'] ) ) {
2086          $editor_styles = $GLOBALS['editor_styles'];
2087  
2088          $editor_styles = array_unique( array_filter( $editor_styles ) );
2089          $style_uri     = get_stylesheet_directory_uri();
2090          $style_dir     = get_stylesheet_directory();
2091  
2092          // Support externally referenced styles (like, say, fonts).
2093          foreach ( $editor_styles as $key => $file ) {
2094              if ( preg_match( '~^(https?:)?//~', $file ) ) {
2095                  $stylesheets[] = esc_url_raw( $file );
2096                  unset( $editor_styles[ $key ] );
2097              }
2098          }
2099  
2100          // Look in a parent theme first, that way child theme CSS overrides.
2101          if ( is_child_theme() ) {
2102              $template_uri = get_template_directory_uri();
2103              $template_dir = get_template_directory();
2104  
2105              foreach ( $editor_styles as $key => $file ) {
2106                  if ( $file && file_exists( "$template_dir/$file" ) ) {
2107                      $stylesheets[] = "$template_uri/$file";
2108                  }
2109              }
2110          }
2111  
2112          foreach ( $editor_styles as $file ) {
2113              if ( $file && file_exists( "$style_dir/$file" ) ) {
2114                  $stylesheets[] = "$style_uri/$file";
2115              }
2116          }
2117      }
2118  
2119      /**
2120       * Filters the array of URLs of stylesheets applied to the editor.
2121       *
2122       * @since 4.3.0
2123       *
2124       * @param string[] $stylesheets Array of URLs of stylesheets to be applied to the editor.
2125       */
2126      return apply_filters( 'editor_stylesheets', $stylesheets );
2127  }
2128  
2129  /**
2130   * Expands a theme's starter content configuration using core-provided data.
2131   *
2132   * @since 4.7.0
2133   *
2134   * @return array Array of starter content.
2135   */
2136  function get_theme_starter_content() {
2137      $theme_support = get_theme_support( 'starter-content' );
2138      if ( is_array( $theme_support ) && ! empty( $theme_support[0] ) && is_array( $theme_support[0] ) ) {
2139          $config = $theme_support[0];
2140      } else {
2141          $config = array();
2142      }
2143  
2144      $core_content = array(
2145          'widgets'   => array(
2146              'text_business_info' => array(
2147                  'text',
2148                  array(
2149                      'title'  => _x( 'Find Us', 'Theme starter content' ),
2150                      'text'   => join(
2151                          '',
2152                          array(
2153                              '<strong>' . _x( 'Address', 'Theme starter content' ) . "</strong>\n",
2154                              _x( '123 Main Street', 'Theme starter content' ) . "\n" . _x( 'New York, NY 10001', 'Theme starter content' ) . "\n\n",
2155                              '<strong>' . _x( 'Hours', 'Theme starter content' ) . "</strong>\n",
2156                              _x( 'Monday&ndash;Friday: 9:00AM&ndash;5:00PM', 'Theme starter content' ) . "\n" . _x( 'Saturday &amp; Sunday: 11:00AM&ndash;3:00PM', 'Theme starter content' ),
2157                          )
2158                      ),
2159                      'filter' => true,
2160                      'visual' => true,
2161                  ),
2162              ),
2163              'text_about'         => array(
2164                  'text',
2165                  array(
2166                      'title'  => _x( 'About This Site', 'Theme starter content' ),
2167                      'text'   => _x( 'This may be a good place to introduce yourself and your site or include some credits.', 'Theme starter content' ),
2168                      'filter' => true,
2169                      'visual' => true,
2170                  ),
2171              ),
2172              'archives'           => array(
2173                  'archives',
2174                  array(
2175                      'title' => _x( 'Archives', 'Theme starter content' ),
2176                  ),
2177              ),
2178              'calendar'           => array(
2179                  'calendar',
2180                  array(
2181                      'title' => _x( 'Calendar', 'Theme starter content' ),
2182                  ),
2183              ),
2184              'categories'         => array(
2185                  'categories',
2186                  array(
2187                      'title' => _x( 'Categories', 'Theme starter content' ),
2188                  ),
2189              ),
2190              'meta'               => array(
2191                  'meta',
2192                  array(
2193                      'title' => _x( 'Meta', 'Theme starter content' ),
2194                  ),
2195              ),
2196              'recent-comments'    => array(
2197                  'recent-comments',
2198                  array(
2199                      'title' => _x( 'Recent Comments', 'Theme starter content' ),
2200                  ),
2201              ),
2202              'recent-posts'       => array(
2203                  'recent-posts',
2204                  array(
2205                      'title' => _x( 'Recent Posts', 'Theme starter content' ),
2206                  ),
2207              ),
2208              'search'             => array(
2209                  'search',
2210                  array(
2211                      'title' => _x( 'Search', 'Theme starter content' ),
2212                  ),
2213              ),
2214          ),
2215          'nav_menus' => array(
2216              'link_home'       => array(
2217                  'type'  => 'custom',
2218                  'title' => _x( 'Home', 'Theme starter content' ),
2219                  'url'   => home_url( '/' ),
2220              ),
2221              'page_home'       => array( // Deprecated in favor of 'link_home'.
2222                  'type'      => 'post_type',
2223                  'object'    => 'page',
2224                  'object_id' => '{{home}}',
2225              ),
2226              'page_about'      => array(
2227                  'type'      => 'post_type',
2228                  'object'    => 'page',
2229                  'object_id' => '{{about}}',
2230              ),
2231              'page_blog'       => array(
2232                  'type'      => 'post_type',
2233                  'object'    => 'page',
2234                  'object_id' => '{{blog}}',
2235              ),
2236              'page_news'       => array(
2237                  'type'      => 'post_type',
2238                  'object'    => 'page',
2239                  'object_id' => '{{news}}',
2240              ),
2241              'page_contact'    => array(
2242                  'type'      => 'post_type',
2243                  'object'    => 'page',
2244                  'object_id' => '{{contact}}',
2245              ),
2246  
2247              'link_email'      => array(
2248                  'title' => _x( 'Email', 'Theme starter content' ),
2249                  'url'   => 'mailto:wordpress@example.com',
2250              ),
2251              'link_facebook'   => array(
2252                  'title' => _x( 'Facebook', 'Theme starter content' ),
2253                  'url'   => 'https://www.facebook.com/wordpress',
2254              ),
2255              'link_foursquare' => array(
2256                  'title' => _x( 'Foursquare', 'Theme starter content' ),
2257                  'url'   => 'https://foursquare.com/',
2258              ),
2259              'link_github'     => array(
2260                  'title' => _x( 'GitHub', 'Theme starter content' ),
2261                  'url'   => 'https://github.com/wordpress/',
2262              ),
2263              'link_instagram'  => array(
2264                  'title' => _x( 'Instagram', 'Theme starter content' ),
2265                  'url'   => 'https://www.instagram.com/explore/tags/wordcamp/',
2266              ),
2267              'link_linkedin'   => array(
2268                  'title' => _x( 'LinkedIn', 'Theme starter content' ),
2269                  'url'   => 'https://www.linkedin.com/company/1089783',
2270              ),
2271              'link_pinterest'  => array(
2272                  'title' => _x( 'Pinterest', 'Theme starter content' ),
2273                  'url'   => 'https://www.pinterest.com/',
2274              ),
2275              'link_twitter'    => array(
2276                  'title' => _x( 'Twitter', 'Theme starter content' ),
2277                  'url'   => 'https://twitter.com/wordpress',
2278              ),
2279              'link_yelp'       => array(
2280                  'title' => _x( 'Yelp', 'Theme starter content' ),
2281                  'url'   => 'https://www.yelp.com',
2282              ),
2283              'link_youtube'    => array(
2284                  'title' => _x( 'YouTube', 'Theme starter content' ),
2285                  'url'   => 'https://www.youtube.com/channel/UCdof4Ju7amm1chz1gi1T2ZA',
2286              ),
2287          ),
2288          'posts'     => array(
2289              'home'             => array(
2290                  'post_type'    => 'page',
2291                  'post_title'   => _x( 'Home', 'Theme starter content' ),
2292                  'post_content' => sprintf(
2293                      "<!-- wp:paragraph -->\n<p>%s</p>\n<!-- /wp:paragraph -->",
2294                      _x( 'Welcome to your site! This is your homepage, which is what most visitors will see when they come to your site for the first time.', 'Theme starter content' )
2295                  ),
2296              ),
2297              'about'            => array(
2298                  'post_type'    => 'page',
2299                  'post_title'   => _x( 'About', 'Theme starter content' ),
2300                  'post_content' => sprintf(
2301                      "<!-- wp:paragraph -->\n<p>%s</p>\n<!-- /wp:paragraph -->",
2302                      _x( 'You might be an artist who would like to introduce yourself and your work here or maybe you&rsquo;re a business with a mission to describe.', 'Theme starter content' )
2303                  ),
2304              ),
2305              'contact'          => array(
2306                  'post_type'    => 'page',
2307                  'post_title'   => _x( 'Contact', 'Theme starter content' ),
2308                  'post_content' => sprintf(
2309                      "<!-- wp:paragraph -->\n<p>%s</p>\n<!-- /wp:paragraph -->",
2310                      _x( 'This is a page with some basic contact information, such as an address and phone number. You might also try a plugin to add a contact form.', 'Theme starter content' )
2311                  ),
2312              ),
2313              'blog'             => array(
2314                  'post_type'  => 'page',
2315                  'post_title' => _x( 'Blog', 'Theme starter content' ),
2316              ),
2317              'news'             => array(
2318                  'post_type'  => 'page',
2319                  'post_title' => _x( 'News', 'Theme starter content' ),
2320              ),
2321  
2322              'homepage-section' => array(
2323                  'post_type'    => 'page',
2324                  'post_title'   => _x( 'A homepage section', 'Theme starter content' ),
2325                  'post_content' => sprintf(
2326                      "<!-- wp:paragraph -->\n<p>%s</p>\n<!-- /wp:paragraph -->",
2327                      _x( 'This is an example of a homepage section. Homepage sections can be any page other than the homepage itself, including the page that shows your latest blog posts.', 'Theme starter content' )
2328                  ),
2329              ),
2330          ),
2331      );
2332  
2333      $content = array();
2334  
2335      foreach ( $config as $type => $args ) {
2336          switch ( $type ) {
2337              // Use options and theme_mods as-is.
2338              case 'options':
2339              case 'theme_mods':
2340                  $content[ $type ] = $config[ $type ];
2341                  break;
2342  
2343              // Widgets are grouped into sidebars.
2344              case 'widgets':
2345                  foreach ( $config[ $type ] as $sidebar_id => $widgets ) {
2346                      foreach ( $widgets as $id => $widget ) {
2347                          if ( is_array( $widget ) ) {
2348  
2349                              // Item extends core content.
2350                              if ( ! empty( $core_content[ $type ][ $id ] ) ) {
2351                                  $widget = array(
2352                                      $core_content[ $type ][ $id ][0],
2353                                      array_merge( $core_content[ $type ][ $id ][1], $widget ),
2354                                  );
2355                              }
2356  
2357                              $content[ $type ][ $sidebar_id ][] = $widget;
2358                          } elseif ( is_string( $widget ) && ! empty( $core_content[ $type ] ) && ! empty( $core_content[ $type ][ $widget ] ) ) {
2359                              $content[ $type ][ $sidebar_id ][] = $core_content[ $type ][ $widget ];
2360                          }
2361                      }
2362                  }
2363                  break;
2364  
2365              // And nav menu items are grouped into nav menus.
2366              case 'nav_menus':
2367                  foreach ( $config[ $type ] as $nav_menu_location => $nav_menu ) {
2368  
2369                      // Ensure nav menus get a name.
2370                      if ( empty( $nav_menu['name'] ) ) {
2371                          $nav_menu['name'] = $nav_menu_location;
2372                      }
2373  
2374                      $content[ $type ][ $nav_menu_location ]['name'] = $nav_menu['name'];
2375  
2376                      foreach ( $nav_menu['items'] as $id => $nav_menu_item ) {
2377                          if ( is_array( $nav_menu_item ) ) {
2378  
2379                              // Item extends core content.
2380                              if ( ! empty( $core_content[ $type ][ $id ] ) ) {
2381                                  $nav_menu_item = array_merge( $core_content[ $type ][ $id ], $nav_menu_item );
2382                              }
2383  
2384                              $content[ $type ][ $nav_menu_location ]['items'][] = $nav_menu_item;
2385                          } elseif ( is_string( $nav_menu_item ) && ! empty( $core_content[ $type ] ) && ! empty( $core_content[ $type ][ $nav_menu_item ] ) ) {
2386                              $content[ $type ][ $nav_menu_location ]['items'][] = $core_content[ $type ][ $nav_menu_item ];
2387                          }
2388                      }
2389                  }
2390                  break;
2391  
2392              // Attachments are posts but have special treatment.
2393              case 'attachments':
2394                  foreach ( $config[ $type ] as $id => $item ) {
2395                      if ( ! empty( $item['file'] ) ) {
2396                          $content[ $type ][ $id ] = $item;
2397                      }
2398                  }
2399                  break;
2400  
2401              // All that's left now are posts (besides attachments).
2402              // Not a default case for the sake of clarity and future work.
2403              case 'posts':
2404                  foreach ( $config[ $type ] as $id => $item ) {
2405                      if ( is_array( $item ) ) {
2406  
2407                          // Item extends core content.
2408                          if ( ! empty( $core_content[ $type ][ $id ] ) ) {
2409                              $item = array_merge( $core_content[ $type ][ $id ], $item );
2410                          }
2411  
2412                          // Enforce a subset of fields.
2413                          $content[ $type ][ $id ] = wp_array_slice_assoc(
2414                              $item,
2415                              array(
2416                                  'post_type',
2417                                  'post_title',
2418                                  'post_excerpt',
2419                                  'post_name',
2420                                  'post_content',
2421                                  'menu_order',
2422                                  'comment_status',
2423                                  'thumbnail',
2424                                  'template',
2425                              )
2426                          );
2427                      } elseif ( is_string( $item ) && ! empty( $core_content[ $type ][ $item ] ) ) {
2428                          $content[ $type ][ $item ] = $core_content[ $type ][ $item ];
2429                      }
2430                  }
2431                  break;
2432          }
2433      }
2434  
2435      /**
2436       * Filters the expanded array of starter content.
2437       *
2438       * @since 4.7.0
2439       *
2440       * @param array $content Array of starter content.
2441       * @param array $config  Array of theme-specific starter content configuration.
2442       */
2443      return apply_filters( 'get_theme_starter_content', $content, $config );
2444  }
2445  
2446  /**
2447   * Registers theme support for a given feature.
2448   *
2449   * Must be called in the theme's functions.php file to work.
2450   * If attached to a hook, it must be {@see 'after_setup_theme'}.
2451   * The {@see 'init'} hook may be too late for some features.
2452   *
2453   * Example usage:
2454   *
2455   *     add_theme_support( 'title-tag' );
2456   *     add_theme_support( 'custom-logo', array(
2457   *         'height' => 480,
2458   *         'width'  => 720,
2459   *     ) );
2460   *
2461   * @since 2.9.0
2462   * @since 3.4.0 The `custom-header-uploads` feature was deprecated.
2463   * @since 3.6.0 The `html5` feature was added.
2464   * @since 3.9.0 The `html5` feature now also accepts 'gallery' and 'caption'.
2465   * @since 4.1.0 The `title-tag` feature was added.
2466   * @since 4.5.0 The `customize-selective-refresh-widgets` feature was added.
2467   * @since 4.7.0 The `starter-content` feature was added.
2468   * @since 5.0.0 The `responsive-embeds`, `align-wide`, `dark-editor-style`, `disable-custom-colors`,
2469   *              `disable-custom-font-sizes`, `editor-color-palette`, `editor-font-sizes`,
2470   *              `editor-styles`, and `wp-block-styles` features were added.
2471   * @since 5.3.0 The `html5` feature now also accepts 'script' and 'style'.
2472   * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
2473   *              by adding it to the function signature.
2474   * @since 5.5.0 The `core-block-patterns` feature was added and is enabled by default.
2475   * @since 5.5.0 The `custom-logo` feature now also accepts 'unlink-homepage-logo'.
2476   *
2477   * @global array $_wp_theme_features
2478   *
2479   * @param string $feature The feature being added. Likely core values include 'post-formats', 'post-thumbnails',
2480   *                        'custom-header', 'custom-background', 'custom-logo', 'menus', 'automatic-feed-links',
2481   *                        'html5', 'title-tag', 'customize-selective-refresh-widgets', 'starter-content',
2482   *                        'responsive-embeds', 'align-wide', 'dark-editor-style', 'disable-custom-colors',
2483   *                        'disable-custom-font-sizes', 'editor-color-palette', 'editor-font-sizes',
2484   *                        'editor-styles', 'wp-block-styles', and 'core-block-patterns'.
2485   * @param mixed  ...$args Optional extra arguments to pass along with certain features.
2486   * @return void|bool False on failure, void otherwise.
2487   */
2488  function add_theme_support( $feature, ...$args ) {
2489      global $_wp_theme_features;
2490  
2491      if ( ! $args ) {
2492          $args = true;
2493      }
2494  
2495      switch ( $feature ) {
2496          case 'post-thumbnails':
2497              // All post types are already supported.
2498              if ( true === get_theme_support( 'post-thumbnails' ) ) {
2499                  return;
2500              }
2501  
2502              /*
2503               * Merge post types with any that already declared their support
2504               * for post thumbnails.
2505               */
2506              if ( isset( $args[0] ) && is_array( $args[0] ) && isset( $_wp_theme_features['post-thumbnails'] ) ) {
2507                  $args[0] = array_unique( array_merge( $_wp_theme_features['post-thumbnails'][0], $args[0] ) );
2508              }
2509  
2510              break;
2511  
2512          case 'post-formats':
2513              if ( isset( $args[0] ) && is_array( $args[0] ) ) {
2514                  $post_formats = get_post_format_slugs();
2515                  unset( $post_formats['standard'] );
2516  
2517                  $args[0] = array_intersect( $args[0], array_keys( $post_formats ) );
2518              }
2519              break;
2520  
2521          case 'html5':
2522              // You can't just pass 'html5', you need to pass an array of types.
2523              if ( empty( $args[0] ) ) {
2524                  // Build an array of types for back-compat.
2525                  $args = array( 0 => array( 'comment-list', 'comment-form', 'search-form' ) );
2526              } elseif ( ! isset( $args[0] ) || ! is_array( $args[0] ) ) {
2527                  _doing_it_wrong( "add_theme_support( 'html5' )", __( 'You need to pass an array of types.' ), '3.6.1' );
2528                  return false;
2529              }
2530  
2531              // Calling 'html5' again merges, rather than overwrites.
2532              if ( isset( $_wp_theme_features['html5'] ) ) {
2533                  $args[0] = array_merge( $_wp_theme_features['html5'][0], $args[0] );
2534              }
2535              break;
2536  
2537          case 'custom-logo':
2538              if ( true === $args ) {
2539                  $args = array( 0 => array() );
2540              }
2541              $defaults = array(
2542                  'width'                => null,
2543                  'height'               => null,
2544                  'flex-width'           => false,
2545                  'flex-height'          => false,
2546                  'header-text'          => '',
2547                  'unlink-homepage-logo' => false,
2548              );
2549              $args[0]  = wp_parse_args( array_intersect_key( $args[0], $defaults ), $defaults );
2550  
2551              // Allow full flexibility if no size is specified.
2552              if ( is_null( $args[0]['width'] ) && is_null( $args[0]['height'] ) ) {
2553                  $args[0]['flex-width']  = true;
2554                  $args[0]['flex-height'] = true;
2555              }
2556              break;
2557  
2558          case 'custom-header-uploads':
2559              return add_theme_support( 'custom-header', array( 'uploads' => true ) );
2560  
2561          case 'custom-header':
2562              if ( true === $args ) {
2563                  $args = array( 0 => array() );
2564              }
2565  
2566              $defaults = array(
2567                  'default-image'          => '',
2568                  'random-default'         => false,
2569                  'width'                  => 0,
2570                  'height'                 => 0,
2571                  'flex-height'            => false,
2572                  'flex-width'             => false,
2573                  'default-text-color'     => '',
2574                  'header-text'            => true,
2575                  'uploads'                => true,
2576                  'wp-head-callback'       => '',
2577                  'admin-head-callback'    => '',
2578                  'admin-preview-callback' => '',
2579                  'video'                  => false,
2580                  'video-active-callback'  => 'is_front_page',
2581              );
2582  
2583              $jit = isset( $args[0]['__jit'] );
2584              unset( $args[0]['__jit'] );
2585  
2586              // Merge in data from previous add_theme_support() calls.
2587              // The first value registered wins. (A child theme is set up first.)
2588              if ( isset( $_wp_theme_features['custom-header'] ) ) {
2589                  $args[0] = wp_parse_args( $_wp_theme_features['custom-header'][0], $args[0] );
2590              }
2591  
2592              // Load in the defaults at the end, as we need to insure first one wins.
2593              // This will cause all constants to be defined, as each arg will then be set to the default.
2594              if ( $jit ) {
2595                  $args[0] = wp_parse_args( $args[0], $defaults );
2596              }
2597  
2598              /*
2599               * If a constant was defined, use that value. Otherwise, define the constant to ensure
2600               * the constant is always accurate (and is not defined later,  overriding our value).
2601               * As stated above, the first value wins.
2602               * Once we get to wp_loaded (just-in-time), define any constants we haven't already.
2603               * Constants are lame. Don't reference them. This is just for backward compatibility.
2604               */
2605  
2606              if ( defined( 'NO_HEADER_TEXT' ) ) {
2607                  $args[0]['header-text'] = ! NO_HEADER_TEXT;
2608              } elseif ( isset( $args[0]['header-text'] ) ) {
2609                  define( 'NO_HEADER_TEXT', empty( $args[0]['header-text'] ) );
2610              }
2611  
2612              if ( defined( 'HEADER_IMAGE_WIDTH' ) ) {
2613                  $args[0]['width'] = (int) HEADER_IMAGE_WIDTH;
2614              } elseif ( isset( $args[0]['width'] ) ) {
2615                  define( 'HEADER_IMAGE_WIDTH', (int) $args[0]['width'] );
2616              }
2617  
2618              if ( defined( 'HEADER_IMAGE_HEIGHT' ) ) {
2619                  $args[0]['height'] = (int) HEADER_IMAGE_HEIGHT;
2620              } elseif ( isset( $args[0]['height'] ) ) {
2621                  define( 'HEADER_IMAGE_HEIGHT', (int) $args[0]['height'] );
2622              }
2623  
2624              if ( defined( 'HEADER_TEXTCOLOR' ) ) {
2625                  $args[0]['default-text-color'] = HEADER_TEXTCOLOR;
2626              } elseif ( isset( $args[0]['default-text-color'] ) ) {
2627                  define( 'HEADER_TEXTCOLOR', $args[0]['default-text-color'] );
2628              }
2629  
2630              if ( defined( 'HEADER_IMAGE' ) ) {
2631                  $args[0]['default-image'] = HEADER_IMAGE;
2632              } elseif ( isset( $args[0]['default-image'] ) ) {
2633                  define( 'HEADER_IMAGE', $args[0]['default-image'] );
2634              }
2635  
2636              if ( $jit && ! empty( $args[0]['default-image'] ) ) {
2637                  $args[0]['random-default'] = false;
2638              }
2639  
2640              // If headers are supported, and we still don't have a defined width or height,
2641              // we have implicit flex sizes.
2642              if ( $jit ) {
2643                  if ( empty( $args[0]['width'] ) && empty( $args[0]['flex-width'] ) ) {
2644                      $args[0]['flex-width'] = true;
2645                  }
2646                  if ( empty( $args[0]['height'] ) && empty( $args[0]['flex-height'] ) ) {
2647                      $args[0]['flex-height'] = true;
2648                  }
2649              }
2650  
2651              break;
2652  
2653          case 'custom-background':
2654              if ( true === $args ) {
2655                  $args = array( 0 => array() );
2656              }
2657  
2658              $defaults = array(
2659                  'default-image'          => '',
2660                  'default-preset'         => 'default',
2661                  'default-position-x'     => 'left',
2662                  'default-position-y'     => 'top',
2663                  'default-size'           => 'auto',
2664                  'default-repeat'         => 'repeat',
2665                  'default-attachment'     => 'scroll',
2666                  'default-color'          => '',
2667                  'wp-head-callback'       => '_custom_background_cb',
2668                  'admin-head-callback'    => '',
2669                  'admin-preview-callback' => '',
2670              );
2671  
2672              $jit = isset( $args[0]['__jit'] );
2673              unset( $args[0]['__jit'] );
2674  
2675              // Merge in data from previous add_theme_support() calls. The first value registered wins.
2676              if ( isset( $_wp_theme_features['custom-background'] ) ) {
2677                  $args[0] = wp_parse_args( $_wp_theme_features['custom-background'][0], $args[0] );
2678              }
2679  
2680              if ( $jit ) {
2681                  $args[0] = wp_parse_args( $args[0], $defaults );
2682              }
2683  
2684              if ( defined( 'BACKGROUND_COLOR' ) ) {
2685                  $args[0]['default-color'] = BACKGROUND_COLOR;
2686              } elseif ( isset( $args[0]['default-color'] ) || $jit ) {
2687                  define( 'BACKGROUND_COLOR', $args[0]['default-color'] );
2688              }
2689  
2690              if ( defined( 'BACKGROUND_IMAGE' ) ) {
2691                  $args[0]['default-image'] = BACKGROUND_IMAGE;
2692              } elseif ( isset( $args[0]['default-image'] ) || $jit ) {
2693                  define( 'BACKGROUND_IMAGE', $args[0]['default-image'] );
2694              }
2695  
2696              break;
2697  
2698          // Ensure that 'title-tag' is accessible in the admin.
2699          case 'title-tag':
2700              // Can be called in functions.php but must happen before wp_loaded, i.e. not in header.php.
2701              if ( did_action( 'wp_loaded' ) ) {
2702                  _doing_it_wrong(
2703                      "add_theme_support( 'title-tag' )",
2704                      sprintf(
2705                          /* translators: 1: title-tag, 2: wp_loaded */
2706                          __( 'Theme support for %1$s should be registered before the %2$s hook.' ),
2707                          '<code>title-tag</code>',
2708                          '<code>wp_loaded</code>'
2709                      ),
2710                      '4.1.0'
2711                  );
2712  
2713                  return false;
2714              }
2715      }
2716  
2717      $_wp_theme_features[ $feature ] = $args;
2718  }
2719  
2720  /**
2721   * Registers the internal custom header and background routines.
2722   *
2723   * @since 3.4.0
2724   * @access private
2725   *
2726   * @global Custom_Image_Header $custom_image_header
2727   * @global Custom_Background   $custom_background
2728   */
2729  function _custom_header_background_just_in_time() {
2730      global $custom_image_header, $custom_background;
2731  
2732      if ( current_theme_supports( 'custom-header' ) ) {
2733          // In case any constants were defined after an add_custom_image_header() call, re-run.
2734          add_theme_support( 'custom-header', array( '__jit' => true ) );
2735  
2736          $args = get_theme_support( 'custom-header' );
2737          if ( $args[0]['wp-head-callback'] ) {
2738              add_action( 'wp_head', $args[0]['wp-head-callback'] );
2739          }
2740  
2741          if ( is_admin() ) {
2742              require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';
2743              $custom_image_header = new Custom_Image_Header( $args[0]['admin-head-callback'], $args[0]['admin-preview-callback'] );
2744          }
2745      }
2746  
2747      if ( current_theme_supports( 'custom-background' ) ) {
2748          // In case any constants were defined after an add_custom_background() call, re-run.
2749          add_theme_support( 'custom-background', array( '__jit' => true ) );
2750  
2751          $args = get_theme_support( 'custom-background' );
2752          add_action( 'wp_head', $args[0]['wp-head-callback'] );
2753  
2754          if ( is_admin() ) {
2755              require_once ABSPATH . 'wp-admin/includes/class-custom-background.php';
2756              $custom_background = new Custom_Background( $args[0]['admin-head-callback'], $args[0]['admin-preview-callback'] );
2757          }
2758      }
2759  }
2760  
2761  /**
2762   * Adds CSS to hide header text for custom logo, based on Customizer setting.
2763   *
2764   * @since 4.5.0
2765   * @access private
2766   */
2767  function _custom_logo_header_styles() {
2768      if ( ! current_theme_supports( 'custom-header', 'header-text' ) && get_theme_support( 'custom-logo', 'header-text' ) && ! get_theme_mod( 'header_text', true ) ) {
2769          $classes = (array) get_theme_support( 'custom-logo', 'header-text' );
2770          $classes = array_map( 'sanitize_html_class', $classes );
2771          $classes = '.' . implode( ', .', $classes );
2772  
2773          $type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
2774          ?>
2775          <!-- Custom Logo: hide header text -->
2776          <style id="custom-logo-css"<?php echo $type_attr; ?>>
2777              <?php echo $classes; ?> {
2778                  position: absolute;
2779                  clip: rect(1px, 1px, 1px, 1px);
2780              }
2781          </style>
2782          <?php
2783      }
2784  }
2785  
2786  /**
2787   * Gets the theme support arguments passed when registering that support.
2788   *
2789   * Example usage:
2790   *
2791   *     get_theme_support( 'custom-logo' );
2792   *     get_theme_support( 'custom-header', 'width' );
2793   *
2794   * @since 3.1.0
2795   * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
2796   *              by adding it to the function signature.
2797   *
2798   * @global array $_wp_theme_features
2799   *
2800   * @param string $feature The feature to check. See add_theme_support() for the list
2801   *                        of possible values.
2802   * @param mixed  ...$args Optional extra arguments to be checked against certain features.
2803   * @return mixed The array of extra arguments or the value for the registered feature.
2804   */
2805  function get_theme_support( $feature, ...$args ) {
2806      global $_wp_theme_features;
2807      if ( ! isset( $_wp_theme_features[ $feature ] ) ) {
2808          return false;
2809      }
2810  
2811      if ( ! $args ) {
2812          return $_wp_theme_features[ $feature ];
2813      }
2814  
2815      switch ( $feature ) {
2816          case 'custom-logo':
2817          case 'custom-header':
2818          case 'custom-background':
2819              if ( isset( $_wp_theme_features[ $feature ][0][ $args[0] ] ) ) {
2820                  return $_wp_theme_features[ $feature ][0][ $args[0] ];
2821              }
2822              return false;
2823  
2824          default:
2825              return $_wp_theme_features[ $feature ];
2826      }
2827  }
2828  
2829  /**
2830   * Allows a theme to de-register its support of a certain feature
2831   *
2832   * Should be called in the theme's functions.php file. Generally would
2833   * be used for child themes to override support from the parent theme.
2834   *
2835   * @since 3.0.0
2836   *
2837   * @see add_theme_support()
2838   *
2839   * @param string $feature The feature being removed. See add_theme_support() for the list
2840   *                        of possible values.
2841   * @return bool|void Whether feature was removed.
2842   */
2843  function remove_theme_support( $feature ) {
2844      // Do not remove internal registrations that are not used directly by themes.
2845      if ( in_array( $feature, array( 'editor-style', 'widgets', 'menus' ), true ) ) {
2846          return false;
2847      }
2848  
2849      return _remove_theme_support( $feature );
2850  }
2851  
2852  /**
2853   * Do not use. Removes theme support internally without knowledge of those not used
2854   * by themes directly.
2855   *
2856   * @access private
2857   * @since 3.1.0
2858   * @global array               $_wp_theme_features
2859   * @global Custom_Image_Header $custom_image_header
2860   * @global Custom_Background   $custom_background
2861   *
2862   * @param string $feature The feature being removed. See add_theme_support() for the list
2863   *                        of possible values.
2864   * @return bool True if support was removed, false if the feature was not registered.
2865   */
2866  function _remove_theme_support( $feature ) {
2867      global $_wp_theme_features;
2868  
2869      switch ( $feature ) {
2870          case 'custom-header-uploads':
2871              if ( ! isset( $_wp_theme_features['custom-header'] ) ) {
2872                  return false;
2873              }
2874              add_theme_support( 'custom-header', array( 'uploads' => false ) );
2875              return; // Do not continue - custom-header-uploads no longer exists.
2876      }
2877  
2878      if ( ! isset( $_wp_theme_features[ $feature ] ) ) {
2879          return false;
2880      }
2881  
2882      switch ( $feature ) {
2883          case 'custom-header':
2884              if ( ! did_action( 'wp_loaded' ) ) {
2885                  break;
2886              }
2887              $support = get_theme_support( 'custom-header' );
2888              if ( isset( $support[0]['wp-head-callback'] ) ) {
2889                  remove_action( 'wp_head', $support[0]['wp-head-callback'] );
2890              }
2891              if ( isset( $GLOBALS['custom_image_header'] ) ) {
2892                  remove_action( 'admin_menu', array( $GLOBALS['custom_image_header'], 'init' ) );
2893                  unset( $GLOBALS['custom_image_header'] );
2894              }
2895              break;
2896  
2897          case 'custom-background':
2898              if ( ! did_action( 'wp_loaded' ) ) {
2899                  break;
2900              }
2901              $support = get_theme_support( 'custom-background' );
2902              if ( isset( $support[0]['wp-head-callback'] ) ) {
2903                  remove_action( 'wp_head', $support[0]['wp-head-callback'] );
2904              }
2905              remove_action( 'admin_menu', array( $GLOBALS['custom_background'], 'init' ) );
2906              unset( $GLOBALS['custom_background'] );
2907              break;
2908      }
2909  
2910      unset( $_wp_theme_features[ $feature ] );
2911  
2912      return true;
2913  }
2914  
2915  /**
2916   * Checks a theme's support for a given feature.
2917   *
2918   * Example usage:
2919   *
2920   *     current_theme_supports( 'custom-logo' );
2921   *     current_theme_supports( 'html5', 'comment-form' );
2922   *
2923   * @since 2.9.0
2924   * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
2925   *              by adding it to the function signature.
2926   *
2927   * @global array $_wp_theme_features
2928   *
2929   * @param string $feature The feature being checked. See add_theme_support() for the list
2930   *                        of possible values.
2931   * @param mixed  ...$args Optional extra arguments to be checked against certain features.
2932   * @return bool True if the current theme supports the feature, false otherwise.
2933   */
2934  function current_theme_supports( $feature, ...$args ) {
2935      global $_wp_theme_features;
2936  
2937      if ( 'custom-header-uploads' === $feature ) {
2938          return current_theme_supports( 'custom-header', 'uploads' );
2939      }
2940  
2941      if ( ! isset( $_wp_theme_features[ $feature ] ) ) {
2942          return false;
2943      }
2944  
2945      // If no args passed then no extra checks need be performed.
2946      if ( ! $args ) {
2947          return true;
2948      }
2949  
2950      switch ( $feature ) {
2951          case 'post-thumbnails':
2952              /*
2953               * post-thumbnails can be registered for only certain content/post types
2954               * by passing an array of types to add_theme_support().
2955               * If no array was passed, then any type is accepted.
2956               */
2957              if ( true === $_wp_theme_features[ $feature ] ) {  // Registered for all types.
2958                  return true;
2959              }
2960              $content_type = $args[0];
2961              return in_array( $content_type, $_wp_theme_features[ $feature ][0], true );
2962  
2963          case 'html5':
2964          case 'post-formats':
2965              /*
2966               * Specific post formats can be registered by passing an array of types
2967               * to add_theme_support().
2968               *
2969               * Specific areas of HTML5 support *must* be passed via an array to add_theme_support().
2970               */
2971              $type = $args[0];
2972              return in_array( $type, $_wp_theme_features[ $feature ][0], true );
2973  
2974          case 'custom-logo':
2975          case 'custom-header':
2976          case 'custom-background':
2977              // Specific capabilities can be registered by passing an array to add_theme_support().
2978              return ( isset( $_wp_theme_features[ $feature ][0][ $args[0] ] ) && $_wp_theme_features[ $feature ][0][ $args[0] ] );
2979      }
2980  
2981      /**
2982       * Filters whether the current theme supports a specific feature.
2983       *
2984       * The dynamic portion of the hook name, `$feature`, refers to the specific
2985       * theme feature. See add_theme_support() for the list of possible values.
2986       *
2987       * @since 3.4.0
2988       *
2989       * @param bool   $supports Whether the current theme supports the given feature. Default true.
2990       * @param array  $args     Array of arguments for the feature.
2991       * @param string $feature  The theme feature.
2992       */
2993      return apply_filters( "current_theme_supports-{$feature}", true, $args, $_wp_theme_features[ $feature ] ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
2994  }
2995  
2996  /**
2997   * Checks a theme's support for a given feature before loading the functions which implement it.
2998   *
2999   * @since 2.9.0
3000   *
3001   * @param string $feature The feature being checked. See add_theme_support() for the list
3002   *                        of possible values.
3003   * @param string $include Path to the file.
3004   * @return bool True if the current theme supports the supplied feature, false otherwise.
3005   */
3006  function require_if_theme_supports( $feature, $include ) {
3007      if ( current_theme_supports( $feature ) ) {
3008          require $include;
3009          return true;
3010      }
3011      return false;
3012  }
3013  
3014  /**
3015   * Registers a theme feature for use in add_theme_support().
3016   *
3017   * This does not indicate that the current theme supports the feature, it only describes
3018   * the feature's supported options.
3019   *
3020   * @since 5.5.0
3021   *
3022   * @see add_theme_support()
3023   *
3024   * @global array $_wp_registered_theme_features
3025   *
3026   * @param string $feature The name uniquely identifying the feature. See add_theme_support()
3027   *                        for the list of possible values.
3028   * @param array  $args {
3029   *     Data used to describe the theme.
3030   *
3031   *     @type string     $type         The type of data associated with this feature.
3032   *                                    Valid values are 'string', 'boolean', 'integer',
3033   *                                    'number', 'array', and 'object'. Defaults to 'boolean'.
3034   *     @type boolean    $variadic     Does this feature utilize the variadic support
3035   *                                    of add_theme_support(), or are all arguments specified
3036   *                                    as the second parameter. Must be used with the "array" type.
3037   *     @type string     $description  A short description of the feature. Included in
3038   *                                    the Themes REST API schema. Intended for developers.
3039   *     @type bool|array $show_in_rest {
3040   *         Whether this feature should be included in the Themes REST API endpoint.
3041   *         Defaults to not being included. When registering an 'array' or 'object' type,
3042   *         this argument must be an array with the 'schema' key.
3043   *
3044   *         @type array    $schema           Specifies the JSON Schema definition describing
3045   *                                          the feature. If any objects in the schema do not include
3046   *                                          the 'additionalProperties' keyword, it is set to false.
3047   *         @type string   $name             An alternate name to be used as the property name
3048   *                                          in the REST API.
3049   *         @type callable $prepare_callback A function used to format the theme support in the REST API.
3050   *                                          Receives the raw theme support value.
3051   *      }
3052   * }
3053   * @return true|WP_Error True if the theme feature was successfully registered, a WP_Error object if not.
3054   */
3055  function register_theme_feature( $feature, $args = array() ) {
3056      global $_wp_registered_theme_features;
3057  
3058      if ( ! is_array( $_wp_registered_theme_features ) ) {
3059          $_wp_registered_theme_features = array();
3060      }
3061  
3062      $defaults = array(
3063          'type'         => 'boolean',
3064          'variadic'     => false,
3065          'description'  => '',
3066          'show_in_rest' => false,
3067      );
3068  
3069      $args = wp_parse_args( $args, $defaults );
3070  
3071      if ( true === $args['show_in_rest'] ) {
3072          $args['show_in_rest'] = array();
3073      }
3074  
3075      if ( is_array( $args['show_in_rest'] ) ) {
3076          $args['show_in_rest'] = wp_parse_args(
3077              $args['show_in_rest'],
3078              array(
3079                  'schema'           => array(),
3080                  'name'             => $feature,
3081                  'prepare_callback' => null,
3082              )
3083          );
3084      }
3085  
3086      if ( ! in_array( $args['type'], array( 'string', 'boolean', 'integer', 'number', 'array', 'object' ), true ) ) {
3087          return new WP_Error(
3088              'invalid_type',
3089              __( 'The feature "type" is not valid JSON Schema type.' )
3090          );
3091      }
3092  
3093      if ( true === $args['variadic'] && 'array' !== $args['type'] ) {
3094          return new WP_Error(
3095              'variadic_must_be_array',
3096              __( 'When registering a "variadic" theme feature, the "type" must be an "array".' )
3097          );
3098      }
3099  
3100      if ( false !== $args['show_in_rest'] && in_array( $args['type'], array( 'array', 'object' ), true ) ) {
3101          if ( ! is_array( $args['show_in_rest'] ) || empty( $args['show_in_rest']['schema'] ) ) {
3102              return new WP_Error(
3103                  'missing_schema',
3104                  __( 'When registering an "array" or "object" feature to show in the REST API, the feature\'s schema must also be defined.' )
3105              );
3106          }
3107  
3108          if ( 'array' === $args['type'] && ! isset( $args['show_in_rest']['schema']['items'] ) ) {
3109              return new WP_Error(
3110                  'missing_schema_items',
3111                  __( 'When registering an "array" feature, the feature\'s schema must include the "items" keyword.' )
3112              );
3113          }
3114  
3115          if ( 'object' === $args['type'] && ! isset( $args['show_in_rest']['schema']['properties'] ) ) {
3116              return new WP_Error(
3117                  'missing_schema_properties',
3118                  __( 'When registering an "object" feature, the feature\'s schema must include the "properties" keyword.' )
3119              );
3120          }
3121      }
3122  
3123      if ( is_array( $args['show_in_rest'] ) ) {
3124          if ( isset( $args['show_in_rest']['prepare_callback'] ) && ! is_callable( $args['show_in_rest']['prepare_callback'] ) ) {
3125              return new WP_Error(
3126                  'invalid_rest_prepare_callback',
3127                  sprintf(
3128                      /* translators: %s: prepare_callback */
3129                      __( 'The "%s" must be a callable function.' ),
3130                      'prepare_callback'
3131                  )
3132              );
3133          }
3134  
3135          $args['show_in_rest']['schema'] = wp_parse_args(
3136              $args['show_in_rest']['schema'],
3137              array(
3138                  'description' => $args['description'],
3139                  'type'        => $args['type'],
3140                  'default'     => false,
3141              )
3142          );
3143  
3144          if ( is_bool( $args['show_in_rest']['schema']['default'] )
3145              && ! in_array( 'boolean', (array) $args['show_in_rest']['schema']['type'], true )
3146          ) {
3147              // Automatically include the "boolean" type when the default value is a boolean.
3148              $args['show_in_rest']['schema']['type'] = (array) $args['show_in_rest']['schema']['type'];
3149              array_unshift( $args['show_in_rest']['schema']['type'], 'boolean' );
3150          }
3151  
3152          $args['show_in_rest']['schema'] = rest_default_additional_properties_to_false( $args['show_in_rest']['schema'] );
3153      }
3154  
3155      $_wp_registered_theme_features[ $feature ] = $args;
3156  
3157      return true;
3158  }
3159  
3160  /**
3161   * Gets the list of registered theme features.
3162   *
3163   * @since 5.5.0
3164   *
3165   * @global array $_wp_registered_theme_features
3166   *
3167   * @return array[] List of theme features, keyed by their name.
3168   */
3169  function get_registered_theme_features() {
3170      global $_wp_registered_theme_features;
3171  
3172      if ( ! is_array( $_wp_registered_theme_features ) ) {
3173          return array();
3174      }
3175  
3176      return $_wp_registered_theme_features;
3177  }
3178  
3179  /**
3180   * Gets the registration config for a theme feature.
3181   *
3182   * @since 5.5.0
3183   *
3184   * @global array $_wp_registered_theme_features
3185   *
3186   * @param string $feature The feature name. See add_theme_support() for the list
3187   *                        of possible values.
3188   * @return array|null The registration args, or null if the feature was not registered.
3189   */
3190  function get_registered_theme_feature( $feature ) {
3191      global $_wp_registered_theme_features;
3192  
3193      if ( ! is_array( $_wp_registered_theme_features ) ) {
3194          return null;
3195      }
3196  
3197      return isset( $_wp_registered_theme_features[ $feature ] ) ? $_wp_registered_theme_features[ $feature ] : null;
3198  }
3199  
3200  /**
3201   * Checks an attachment being deleted to see if it's a header or background image.
3202   *
3203   * If true it removes the theme modification which would be pointing at the deleted
3204   * attachment.
3205   *
3206   * @access private
3207   * @since 3.0.0
3208   * @since 4.3.0 Also removes `header_image_data`.
3209   * @since 4.5.0 Also removes custom logo theme mods.
3210   *
3211   * @param int $id The attachment ID.
3212   */
3213  function _delete_attachment_theme_mod( $id ) {
3214      $attachment_image = wp_get_attachment_url( $id );
3215      $header_image     = get_header_image();
3216      $background_image = get_background_image();
3217      $custom_logo_id   = get_theme_mod( 'custom_logo' );
3218  
3219      if ( $custom_logo_id && $custom_logo_id == $id ) {
3220          remove_theme_mod( 'custom_logo' );
3221          remove_theme_mod( 'header_text' );
3222      }
3223  
3224      if ( $header_image && $header_image == $attachment_image ) {
3225          remove_theme_mod( 'header_image' );
3226          remove_theme_mod( 'header_image_data' );
3227      }
3228  
3229      if ( $background_image && $background_image == $attachment_image ) {
3230          remove_theme_mod( 'background_image' );
3231      }
3232  }
3233  
3234  /**
3235   * Checks if a theme has been changed and runs 'after_switch_theme' hook on the next WP load.
3236   *
3237   * See {@see 'after_switch_theme'}.
3238   *
3239   * @since 3.3.0
3240   */
3241  function check_theme_switched() {
3242      $stylesheet = get_option( 'theme_switched' );
3243      if ( $stylesheet ) {
3244          $old_theme = wp_get_theme( $stylesheet );
3245  
3246          // Prevent widget & menu mapping from running since Customizer already called it up front.
3247          if ( get_option( 'theme_switched_via_customizer' ) ) {
3248              remove_action( 'after_switch_theme', '_wp_menus_changed' );
3249              remove_action( 'after_switch_theme', '_wp_sidebars_changed' );
3250              update_option( 'theme_switched_via_customizer', false );
3251          }
3252  
3253          if ( $old_theme->exists() ) {
3254              /**
3255               * Fires on the first WP load after a theme switch if the old theme still exists.
3256               *
3257               * This action fires multiple times and the parameters differs
3258               * according to the context, if the old theme exists or not.
3259               * If the old theme is missing, the parameter will be the slug
3260               * of the old theme.
3261               *
3262               * @since 3.3.0
3263               *
3264               * @param string   $old_name  Old theme name.
3265               * @param WP_Theme $old_theme WP_Theme instance of the old theme.
3266               */
3267              do_action( 'after_switch_theme', $old_theme->get( 'Name' ), $old_theme );
3268          } else {
3269              /** This action is documented in wp-includes/theme.php */
3270              do_action( 'after_switch_theme', $stylesheet, $old_theme );
3271          }
3272          flush_rewrite_rules();
3273  
3274          update_option( 'theme_switched', false );
3275      }
3276  }
3277  
3278  /**
3279   * Includes and instantiates the WP_Customize_Manager class.
3280   *
3281   * Loads the Customizer at plugins_loaded when accessing the customize.php admin
3282   * page or when any request includes a wp_customize=on param or a customize_changeset
3283   * param (a UUID). This param is a signal for whether to bootstrap the Customizer when
3284   * WordPress is loading, especially in the Customizer preview
3285   * or when making Customizer Ajax requests for widgets or menus.
3286   *
3287   * @since 3.4.0
3288   *
3289   * @global WP_Customize_Manager $wp_customize
3290   */
3291  function _wp_customize_include() {
3292  
3293      $is_customize_admin_page = ( is_admin() && 'customize.php' === basename( $_SERVER['PHP_SELF'] ) );
3294      $should_include          = (
3295          $is_customize_admin_page
3296          ||
3297          ( isset( $_REQUEST['wp_customize'] ) && 'on' === $_REQUEST['wp_customize'] )
3298          ||
3299          ( ! empty( $_GET['customize_changeset_uuid'] ) || ! empty( $_POST['customize_changeset_uuid'] ) )
3300      );
3301  
3302      if ( ! $should_include ) {
3303          return;
3304      }
3305  
3306      /*
3307       * Note that wp_unslash() is not being used on the input vars because it is
3308       * called before wp_magic_quotes() gets called. Besides this fact, none of
3309       * the values should contain any characters needing slashes anyway.
3310       */
3311      $keys       = array( 'changeset_uuid', 'customize_changeset_uuid', 'customize_theme', 'theme', 'customize_messenger_channel', 'customize_autosaved' );
3312      $input_vars = array_merge(
3313          wp_array_slice_assoc( $_GET, $keys ),
3314          wp_array_slice_assoc( $_POST, $keys )
3315      );
3316  
3317      $theme             = null;
3318      $autosaved         = null;
3319      $messenger_channel = null;
3320  
3321      // Value false indicates UUID should be determined after_setup_theme
3322      // to either re-use existing saved changeset or else generate a new UUID if none exists.
3323      $changeset_uuid = false;
3324  
3325      // Set initially fo false since defaults to true for back-compat;
3326      // can be overridden via the customize_changeset_branching filter.
3327      $branching = false;
3328  
3329      if ( $is_customize_admin_page && isset( $input_vars['changeset_uuid'] ) ) {
3330          $changeset_uuid = sanitize_key( $input_vars['changeset_uuid'] );
3331      } elseif ( ! empty( $input_vars['customize_changeset_uuid'] ) ) {
3332          $changeset_uuid = sanitize_key( $input_vars['customize_changeset_uuid'] );
3333      }
3334  
3335      // Note that theme will be sanitized via WP_Theme.
3336      if ( $is_customize_admin_page && isset( $input_vars['theme'] ) ) {
3337          $theme = $input_vars['theme'];
3338      } elseif ( isset( $input_vars['customize_theme'] ) ) {
3339          $theme = $input_vars['customize_theme'];
3340      }
3341  
3342      if ( ! empty( $input_vars['customize_autosaved'] ) ) {
3343          $autosaved = true;
3344      }
3345  
3346      if ( isset( $input_vars['customize_messenger_channel'] ) ) {
3347          $messenger_channel = sanitize_key( $input_vars['customize_messenger_channel'] );
3348      }
3349  
3350      /*
3351       * Note that settings must be previewed even outside the customizer preview
3352       * and also in the customizer pane itself. This is to enable loading an existing
3353       * changeset into the customizer. Previewing the settings only has to be prevented
3354       * here in the case of a customize_save action because this will cause WP to think
3355       * there is nothing changed that needs to be saved.
3356       */
3357      $is_customize_save_action = (
3358          wp_doing_ajax()
3359          &&
3360          isset( $_REQUEST['action'] )
3361          &&
3362          'customize_save' === wp_unslash( $_REQUEST['action'] )
3363      );
3364      $settings_previewed       = ! $is_customize_save_action;
3365  
3366      require_once  ABSPATH . WPINC . '/class-wp-customize-manager.php';
3367      $GLOBALS['wp_customize'] = new WP_Customize_Manager( compact( 'changeset_uuid', 'theme', 'messenger_channel', 'settings_previewed', 'autosaved', 'branching' ) );
3368  }
3369  
3370  /**
3371   * Publishes a snapshot's changes.
3372   *
3373   * @since 4.7.0
3374   * @access private
3375   *
3376   * @global wpdb                 $wpdb         WordPress database abstraction object.
3377   * @global WP_Customize_Manager $wp_customize Customizer instance.
3378   *
3379   * @param string  $new_status     New post status.
3380   * @param string  $old_status     Old post status.
3381   * @param WP_Post $changeset_post Changeset post object.
3382   */
3383  function _wp_customize_publish_changeset( $new_status, $old_status, $changeset_post ) {
3384      global $wp_customize, $wpdb;
3385  
3386      $is_publishing_changeset = (
3387          'customize_changeset' === $changeset_post->post_type
3388          &&
3389          'publish' === $new_status
3390          &&
3391          'publish' !== $old_status
3392      );
3393      if ( ! $is_publishing_changeset ) {
3394          return;
3395      }
3396  
3397      if ( empty( $wp_customize ) ) {
3398          require_once  ABSPATH . WPINC . '/class-wp-customize-manager.php';
3399          $wp_customize = new WP_Customize_Manager(
3400              array(
3401                  'changeset_uuid'     => $changeset_post->post_name,
3402                  'settings_previewed' => false,
3403              )
3404          );
3405      }
3406  
3407      if ( ! did_action( 'customize_register' ) ) {
3408          /*
3409           * When running from CLI or Cron, the customize_register action will need
3410           * to be triggered in order for core, themes, and plugins to register their
3411           * settings. Normally core will add_action( 'customize_register' ) at
3412           * priority 10 to register the core settings, and if any themes/plugins
3413           * also add_action( 'customize_register' ) at the same priority, they
3414           * will have a $wp_customize with those settings registered since they
3415           * call add_action() afterward, normally. However, when manually doing
3416           * the customize_register action after the setup_theme, then the order
3417           * will be reversed for two actions added at priority 10, resulting in
3418           * the core settings no longer being available as expected to themes/plugins.
3419           * So the following manually calls the method that registers the core
3420           * settings up front before doing the action.
3421           */
3422          remove_action( 'customize_register', array( $wp_customize, 'register_controls' ) );
3423          $wp_customize->register_controls();
3424  
3425          /** This filter is documented in /wp-includes/class-wp-customize-manager.php */
3426          do_action( 'customize_register', $wp_customize );
3427      }
3428      $wp_customize->_publish_changeset_values( $changeset_post->ID );
3429  
3430      /*
3431       * Trash the changeset post if revisions are not enabled. Unpublished
3432       * changesets by default get garbage collected due to the auto-draft status.
3433       * When a changeset post is published, however, it would no longer get cleaned
3434       * out. This is a problem when the changeset posts are never displayed anywhere,
3435       * since they would just be endlessly piling up. So here we use the revisions
3436       * feature to indicate whether or not a published changeset should get trashed
3437       * and thus garbage collected.
3438       */
3439      if ( ! wp_revisions_enabled( $changeset_post ) ) {
3440          $wp_customize->trash_changeset_post( $changeset_post->ID );
3441      }
3442  }
3443  
3444  /**
3445   * Filters changeset post data upon insert to ensure post_name is intact.
3446   *
3447   * This is needed to prevent the post_name from being dropped when the post is
3448   * transitioned into pending status by a contributor.
3449   *
3450   * @since 4.7.0
3451   *
3452   * @see wp_insert_post()
3453   *
3454   * @param array $post_data          An array of slashed post data.
3455   * @param array $supplied_post_data An array of sanitized, but otherwise unmodified post data.
3456   * @return array Filtered data.
3457   */
3458  function _wp_customize_changeset_filter_insert_post_data( $post_data, $supplied_post_data ) {
3459      if ( isset( $post_data['post_type'] ) && 'customize_changeset' === $post_data['post_type'] ) {
3460  
3461          // Prevent post_name from being dropped, such as when contributor saves a changeset post as pending.
3462          if ( empty( $post_data['post_name'] ) && ! empty( $supplied_post_data['post_name'] ) ) {
3463              $post_data['post_name'] = $supplied_post_data['post_name'];
3464          }
3465      }
3466      return $post_data;
3467  }
3468  
3469  /**
3470   * Adds settings for the customize-loader script.
3471   *
3472   * @since 3.4.0
3473   */
3474  function _wp_customize_loader_settings() {
3475      $admin_origin = parse_url( admin_url() );
3476      $home_origin  = parse_url( home_url() );
3477      $cross_domain = ( strtolower( $admin_origin['host'] ) != strtolower( $home_origin['host'] ) );
3478  
3479      $browser = array(
3480          'mobile' => wp_is_mobile(),
3481          'ios'    => wp_is_mobile() && preg_match( '/iPad|iPod|iPhone/', $_SERVER['HTTP_USER_AGENT'] ),
3482      );
3483  
3484      $settings = array(
3485          'url'           => esc_url( admin_url( 'customize.php' ) ),
3486          'isCrossDomain' => $cross_domain,
3487          'browser'       => $browser,
3488          'l10n'          => array(
3489              'saveAlert'       => __( 'The changes you made will be lost if you navigate away from this page.' ),
3490              'mainIframeTitle' => __( 'Customizer' ),
3491          ),
3492      );
3493  
3494      $script = 'var _wpCustomizeLoaderSettings = ' . wp_json_encode( $settings ) . ';';
3495  
3496      $wp_scripts = wp_scripts();
3497      $data       = $wp_scripts->get_data( 'customize-loader', 'data' );
3498      if ( $data ) {
3499          $script = "$data\n$script";
3500      }
3501  
3502      $wp_scripts->add_data( 'customize-loader', 'data', $script );
3503  }
3504  
3505  /**
3506   * Returns a URL to load the Customizer.
3507   *
3508   * @since 3.4.0
3509   *
3510   * @param string $stylesheet Optional. Theme to customize. Defaults to current theme.
3511   *                           The theme's stylesheet will be urlencoded if necessary.
3512   * @return string
3513   */
3514  function wp_customize_url( $stylesheet = '' ) {
3515      $url = admin_url( 'customize.php' );
3516      if ( $stylesheet ) {
3517          $url .= '?theme=' . urlencode( $stylesheet );
3518      }
3519      return esc_url( $url );
3520  }
3521  
3522  /**
3523   * Prints a script to check whether or not the Customizer is supported,
3524   * and apply either the no-customize-support or customize-support class
3525   * to the body.
3526   *
3527   * This function MUST be called inside the body tag.
3528   *
3529   * Ideally, call this function immediately after the body tag is opened.
3530   * This prevents a flash of unstyled content.
3531   *
3532   * It is also recommended that you add the "no-customize-support" class
3533   * to the body tag by default.
3534   *
3535   * @since 3.4.0
3536   * @since 4.7.0 Support for IE8 and below is explicitly removed via conditional comments.
3537   * @since 5.5.0 IE8 and older are no longer supported.
3538   */
3539  function wp_customize_support_script() {
3540      $admin_origin = parse_url( admin_url() );
3541      $home_origin  = parse_url( home_url() );
3542      $cross_domain = ( strtolower( $admin_origin['host'] ) != strtolower( $home_origin['host'] ) );
3543      $type_attr    = current_theme_supports( 'html5', 'script' ) ? '' : ' type="text/javascript"';
3544      ?>
3545      <script<?php echo $type_attr; ?>>
3546          (function() {
3547              var request, b = document.body, c = 'className', cs = 'customize-support', rcs = new RegExp('(^|\\s+)(no-)?'+cs+'(\\s+|$)');
3548  
3549      <?php    if ( $cross_domain ) : ?>
3550              request = (function(){ var xhr = new XMLHttpRequest(); return ('withCredentials' in xhr); })();
3551      <?php    else : ?>
3552              request = true;
3553      <?php    endif; ?>
3554  
3555              b[c] = b[c].replace( rcs, ' ' );
3556              // The customizer requires postMessage and CORS (if the site is cross domain).
3557              b[c] += ( window.postMessage && request ? ' ' : ' no-' ) + cs;
3558          }());
3559      </script>
3560      <?php
3561  }
3562  
3563  /**
3564   * Whether the site is being previewed in the Customizer.
3565   *
3566   * @since 4.0.0
3567   *
3568   * @global WP_Customize_Manager $wp_customize Customizer instance.
3569   *
3570   * @return bool True if the site is being previewed in the Customizer, false otherwise.
3571   */
3572  function is_customize_preview() {
3573      global $wp_customize;
3574  
3575      return ( $wp_customize instanceof WP_Customize_Manager ) && $wp_customize->is_preview();
3576  }
3577  
3578  /**
3579   * Makes sure that auto-draft posts get their post_date bumped or status changed to draft to prevent premature garbage-collection.
3580   *
3581   * When a changeset is updated but remains an auto-draft, ensure the post_date
3582   * for the auto-draft posts remains the same so that it will be
3583   * garbage-collected at the same time by `wp_delete_auto_drafts()`. Otherwise,
3584   * if the changeset is updated to be a draft then update the posts
3585   * to have a far-future post_date so that they will never be garbage collected
3586   * unless the changeset post itself is deleted.
3587   *
3588   * When a changeset is updated to be a persistent draft or to be scheduled for
3589   * publishing, then transition any dependent auto-drafts to a draft status so
3590   * that they likewise will not be garbage-collected but also so that they can
3591   * be edited in the admin before publishing since there is not yet a post/page
3592   * editing flow in the Customizer. See #39752.
3593   *
3594   * @link https://core.trac.wordpress.org/ticket/39752
3595   *
3596   * @since 4.8.0
3597   * @access private
3598   * @see wp_delete_auto_drafts()
3599   *
3600   * @global wpdb $wpdb WordPress database abstraction object.
3601   *
3602   * @param string   $new_status Transition to this post status.
3603   * @param string   $old_status Previous post status.
3604   * @param \WP_Post $post       Post data.
3605   */
3606  function _wp_keep_alive_customize_changeset_dependent_auto_drafts( $new_status, $old_status, $post ) {
3607      global $wpdb;
3608      unset( $old_status );
3609  
3610      // Short-circuit if not a changeset or if the changeset was published.
3611      if ( 'customize_changeset' !== $post->post_type || 'publish' === $new_status ) {
3612          return;
3613      }
3614  
3615      $data = json_decode( $post->post_content, true );
3616      if ( empty( $data['nav_menus_created_posts']['value'] ) ) {
3617          return;
3618      }
3619  
3620      /*
3621       * Actually, in lieu of keeping alive, trash any customization drafts here if the changeset itself is
3622       * getting trashed. This is needed because when a changeset transitions to a draft, then any of the
3623       * dependent auto-draft post/page stubs will also get transitioned to customization drafts which
3624       * are then visible in the WP Admin. We cannot wait for the deletion of the changeset in which
3625       * _wp_delete_customize_changeset_dependent_auto_drafts() will be called, since they need to be
3626       * trashed to remove from visibility immediately.
3627       */
3628      if ( 'trash' === $new_status ) {
3629          foreach ( $data['nav_menus_created_posts']['value'] as $post_id ) {
3630              if ( ! empty( $post_id ) && 'draft' === get_post_status( $post_id ) ) {
3631                  wp_trash_post( $post_id );
3632              }
3633          }
3634          return;
3635      }
3636  
3637      $post_args = array();
3638      if ( 'auto-draft' === $new_status ) {
3639          /*
3640           * Keep the post date for the post matching the changeset
3641           * so that it will not be garbage-collected before the changeset.
3642           */
3643          $post_args['post_date'] = $post->post_date; // Note wp_delete_auto_drafts() only looks at this date.
3644      } else {
3645          /*
3646           * Since the changeset no longer has an auto-draft (and it is not published)
3647           * it is now a persistent changeset, a long-lived draft, and so any
3648           * associated auto-draft posts should likewise transition into having a draft
3649           * status. These drafts will be treated differently than regular drafts in
3650           * that they will be tied to the given changeset. The publish meta box is
3651           * replaced with a notice about how the post is part of a set of customized changes
3652           * which will be published when the changeset is published.
3653           */
3654          $post_args['post_status'] = 'draft';
3655      }
3656  
3657      foreach ( $data['nav_menus_created_posts']['value'] as $post_id ) {
3658          if ( empty( $post_id ) || 'auto-draft' !== get_post_status( $post_id ) ) {
3659              continue;
3660          }
3661          $wpdb->update(
3662              $wpdb->posts,
3663              $post_args,
3664              array( 'ID' => $post_id )
3665          );
3666          clean_post_cache( $post_id );
3667      }
3668  }
3669  
3670  /**
3671   * Creates the initial theme features when the 'setup_theme' action is fired.
3672   *
3673   * See {@see 'setup_theme'}.
3674   *
3675   * @since 5.5.0
3676   */
3677  function create_initial_theme_features() {
3678      register_theme_feature(
3679          'align-wide',
3680          array(
3681              'description'  => __( 'Whether theme opts in to wide alignment CSS class.' ),
3682              'show_in_rest' => true,
3683          )
3684      );
3685      register_theme_feature(
3686          'automatic-feed-links',
3687          array(
3688              'description'  => __( 'Whether posts and comments RSS feed links are added to head.' ),
3689              'show_in_rest' => true,
3690          )
3691      );
3692      register_theme_feature(
3693          'custom-background',
3694          array(
3695              'description'  => __( 'Custom background if defined by the theme.' ),
3696              'type'         => 'object',
3697              'show_in_rest' => array(
3698                  'schema' => array(
3699                      'properties' => array(
3700                          'default-image'      => array(
3701                              'type'   => 'string',
3702                              'format' => 'uri',
3703                          ),
3704                          'default-preset'     => array(
3705                              'type' => 'string',
3706                              'enum' => array(
3707                                  'default',
3708                                  'fill',
3709                                  'fit',
3710                                  'repeat',
3711                                  'custom',
3712                              ),
3713                          ),
3714                          'default-position-x' => array(
3715                              'type' => 'string',
3716                              'enum' => array(
3717                                  'left',
3718                                  'center',
3719                                  'right',
3720                              ),
3721                          ),
3722                          'default-position-y' => array(
3723                              'type' => 'string',
3724                              'enum' => array(
3725                                  'left',
3726                                  'center',
3727                                  'right',
3728                              ),
3729                          ),
3730                          'default-size'       => array(
3731                              'type' => 'string',
3732                              'enum' => array(
3733                                  'auto',
3734                                  'contain',
3735                                  'cover',
3736                              ),
3737                          ),
3738                          'default-repeat'     => array(
3739                              'type' => 'string',
3740                              'enum' => array(
3741                                  'repeat-x',
3742                                  'repeat-y',
3743                                  'repeat',
3744                                  'no-repeat',
3745                              ),
3746                          ),
3747                          'default-attachment' => array(
3748                              'type' => 'string',
3749                              'enum' => array(
3750                                  'scroll',
3751                                  'fixed',
3752                              ),
3753                          ),
3754                          'default-color'      => array(
3755                              'type' => 'string',
3756                          ),
3757                      ),
3758                  ),
3759              ),
3760          )
3761      );
3762      register_theme_feature(
3763          'custom-header',
3764          array(
3765              'description'  => __( 'Custom header if defined by the theme.' ),
3766              'type'         => 'object',
3767              'show_in_rest' => array(
3768                  'schema' => array(
3769                      'properties' => array(
3770                          'default-image'      => array(
3771                              'type'   => 'string',
3772                              'format' => 'uri',
3773                          ),
3774                          'random-default'     => array(
3775                              'type' => 'boolean',
3776                          ),
3777                          'width'              => array(
3778                              'type' => 'integer',
3779                          ),
3780                          'height'             => array(
3781                              'type' => 'integer',
3782                          ),
3783                          'flex-height'        => array(
3784                              'type' => 'boolean',
3785                          ),
3786                          'flex-width'         => array(
3787                              'type' => 'boolean',
3788                          ),
3789                          'default-text-color' => array(
3790                              'type' => 'string',
3791                          ),
3792                          'header-text'        => array(
3793                              'type' => 'boolean',
3794                          ),
3795                          'uploads'            => array(
3796                              'type' => 'boolean',
3797                          ),
3798                          'video'              => array(
3799                              'type' => 'boolean',
3800                          ),
3801                      ),
3802                  ),
3803              ),
3804          )
3805      );
3806      register_theme_feature(
3807          'custom-logo',
3808          array(
3809              'type'         => 'object',
3810              'description'  => __( 'Custom logo if defined by the theme.' ),
3811              'show_in_rest' => array(
3812                  'schema' => array(
3813                      'properties' => array(
3814                          'width'                => array(
3815                              'type' => 'integer',
3816                          ),
3817                          'height'               => array(
3818                              'type' => 'integer',
3819                          ),
3820                          'flex-width'           => array(
3821                              'type' => 'boolean',
3822                          ),
3823                          'flex-height'          => array(
3824                              'type' => 'boolean',
3825                          ),
3826                          'header-text'          => array(
3827                              'type'  => 'array',
3828                              'items' => array(
3829                                  'type' => 'string',
3830                              ),
3831                          ),
3832                          'unlink-homepage-logo' => array(
3833                              'type' => 'boolean',
3834                          ),
3835                      ),
3836                  ),
3837              ),
3838          )
3839      );
3840      register_theme_feature(
3841          'customize-selective-refresh-widgets',
3842          array(
3843              'description'  => __( 'Whether the theme enables Selective Refresh for Widgets being managed with the Customizer.' ),
3844              'show_in_rest' => true,
3845          )
3846      );
3847      register_theme_feature(
3848          'dark-editor-style',
3849          array(
3850              'description'  => __( 'Whether theme opts in to the dark editor style UI.' ),
3851              'show_in_rest' => true,
3852          )
3853      );
3854      register_theme_feature(
3855          'disable-custom-colors',
3856          array(
3857              'description'  => __( 'Whether the theme disables custom colors.' ),
3858              'show_in_rest' => true,
3859          )
3860      );
3861      register_theme_feature(
3862          'disable-custom-font-sizes',
3863          array(
3864              'description'  => __( 'Whether the theme disables custom font sizes.' ),
3865              'show_in_rest' => true,
3866          )
3867      );
3868      register_theme_feature(
3869          'disable-custom-gradients',
3870          array(
3871              'description'  => __( 'Whether the theme disables custom gradients.' ),
3872              'show_in_rest' => true,
3873          )
3874      );
3875      register_theme_feature(
3876          'editor-color-palette',
3877          array(
3878              'type'         => 'array',
3879              'description'  => __( 'Custom color palette if defined by the theme.' ),
3880              'show_in_rest' => array(
3881                  'schema' => array(
3882                      'items' => array(
3883                          'type'       => 'object',
3884                          'properties' => array(
3885                              'name'  => array(
3886                                  'type' => 'string',
3887                              ),
3888                              'slug'  => array(
3889                                  'type' => 'string',
3890                              ),
3891                              'color' => array(
3892                                  'type' => 'string',
3893                              ),
3894                          ),
3895                      ),
3896                  ),
3897              ),
3898          )
3899      );
3900      register_theme_feature(
3901          'editor-font-sizes',
3902          array(
3903              'type'         => 'array',
3904              'description'  => __( 'Custom font sizes if defined by the theme.' ),
3905              'show_in_rest' => array(
3906                  'schema' => array(
3907                      'items' => array(
3908                          'type'       => 'object',
3909                          'properties' => array(
3910                              'name' => array(
3911                                  'type' => 'string',
3912                              ),
3913                              'size' => array(
3914                                  'type' => 'number',
3915                              ),
3916                              'slug' => array(
3917                                  'type' => 'string',
3918                              ),
3919                          ),
3920                      ),
3921                  ),
3922              ),
3923          )
3924      );
3925      register_theme_feature(
3926          'editor-gradient-presets',
3927          array(
3928              'type'         => 'array',
3929              'description'  => __( 'Custom gradient presets if defined by the theme.' ),
3930              'show_in_rest' => array(
3931                  'schema' => array(
3932                      'items' => array(
3933                          'type'       => 'object',
3934                          'properties' => array(
3935                              'name'     => array(
3936                                  'type' => 'string',
3937                              ),
3938                              'gradient' => array(
3939                                  'type' => 'string',
3940                              ),
3941                              'slug'     => array(
3942                                  'type' => 'string',
3943                              ),
3944                          ),
3945                      ),
3946                  ),
3947              ),
3948          )
3949      );
3950      register_theme_feature(
3951          'editor-styles',
3952          array(
3953              'description'  => __( 'Whether theme opts in to the editor styles CSS wrapper.' ),
3954              'show_in_rest' => true,
3955          )
3956      );
3957      register_theme_feature(
3958          'html5',
3959          array(
3960              'type'         => 'array',
3961              'description'  => __( 'Allows use of HTML5 markup for search forms, comment forms, comment lists, gallery, and caption.' ),
3962              'show_in_rest' => array(
3963                  'schema' => array(
3964                      'items' => array(
3965                          'type' => 'string',
3966                          'enum' => array(
3967                              'search-form',
3968                              'comment-form',
3969                              'comment-list',
3970                              'gallery',
3971                              'caption',
3972                              'script',
3973                              'style',
3974                          ),
3975                      ),
3976                  ),
3977              ),
3978          )
3979      );
3980      register_theme_feature(
3981          'post-formats',
3982          array(
3983              'type'         => 'array',
3984              'description'  => __( 'Post formats supported.' ),
3985              'show_in_rest' => array(
3986                  'name'             => 'formats',
3987                  'schema'           => array(
3988                      'items'   => array(
3989                          'type' => 'string',
3990                          'enum' => get_post_format_slugs(),
3991                      ),
3992                      'default' => array( 'standard' ),
3993                  ),
3994                  'prepare_callback' => static function ( $formats ) {
3995                      $formats = is_array( $formats ) ? array_values( $formats[0] ) : array();
3996                      $formats = array_merge( array( 'standard' ), $formats );
3997  
3998                      return $formats;
3999                  },
4000              ),
4001          )
4002      );
4003      register_theme_feature(
4004          'post-thumbnails',
4005          array(
4006              'type'         => 'array',
4007              'description'  => __( 'The post types that support thumbnails or true if all post types are supported.' ),
4008              'show_in_rest' => array(
4009                  'type'   => array( 'boolean', 'array' ),
4010                  'schema' => array(
4011                      'items' => array(
4012                          'type' => 'string',
4013                      ),
4014                  ),
4015              ),
4016          )
4017      );
4018      register_theme_feature(
4019          'responsive-embeds',
4020          array(
4021              'description'  => __( 'Whether the theme supports responsive embedded content.' ),
4022              'show_in_rest' => true,
4023          )
4024      );
4025      register_theme_feature(
4026          'title-tag',
4027          array(
4028              'description'  => __( 'Whether the theme can manage the document title tag.' ),
4029              'show_in_rest' => true,
4030          )
4031      );
4032      register_theme_feature(
4033          'wp-block-styles',
4034          array(
4035              'description'  => __( 'Whether theme opts in to default WordPress block styles for viewing.' ),
4036              'show_in_rest' => true,
4037          )
4038      );
4039  }


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