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

   1  <?php
   2  /**
   3   * WordPress environment setup class.
   4   *
   5   * @package WordPress
   6   * @since 2.0.0
   7   */
   8  class WP {
   9      /**
  10       * Public query variables.
  11       *
  12       * Long list of public query variables.
  13       *
  14       * @since 2.0.0
  15       * @var string[]
  16       */
  17      public $public_query_vars = array( 'm', 'p', 'posts', 'w', 'cat', 'withcomments', 'withoutcomments', 's', 'search', 'exact', 'sentence', 'calendar', 'page', 'paged', 'more', 'tb', 'pb', 'author', 'order', 'orderby', 'year', 'monthnum', 'day', 'hour', 'minute', 'second', 'name', 'category_name', 'tag', 'feed', 'author_name', 'pagename', 'page_id', 'error', 'attachment', 'attachment_id', 'subpost', 'subpost_id', 'preview', 'robots', 'favicon', 'taxonomy', 'term', 'cpage', 'post_type', 'embed' );
  18  
  19      /**
  20       * Private query variables.
  21       *
  22       * Long list of private query variables.
  23       *
  24       * @since 2.0.0
  25       * @var string[]
  26       */
  27      public $private_query_vars = array( 'offset', 'posts_per_page', 'posts_per_archive_page', 'showposts', 'nopaging', 'post_type', 'post_status', 'category__in', 'category__not_in', 'category__and', 'tag__in', 'tag__not_in', 'tag__and', 'tag_slug__in', 'tag_slug__and', 'tag_id', 'post_mime_type', 'perm', 'comments_per_page', 'post__in', 'post__not_in', 'post_parent', 'post_parent__in', 'post_parent__not_in', 'title', 'fields' );
  28  
  29      /**
  30       * Extra query variables set by the user.
  31       *
  32       * @since 2.1.0
  33       * @var array
  34       */
  35      public $extra_query_vars = array();
  36  
  37      /**
  38       * Query variables for setting up the WordPress Query Loop.
  39       *
  40       * @since 2.0.0
  41       * @var array
  42       */
  43      public $query_vars = array();
  44  
  45      /**
  46       * String parsed to set the query variables.
  47       *
  48       * @since 2.0.0
  49       * @var string
  50       */
  51      public $query_string = '';
  52  
  53      /**
  54       * The request path, e.g. 2015/05/06.
  55       *
  56       * @since 2.0.0
  57       * @var string
  58       */
  59      public $request = '';
  60  
  61      /**
  62       * Rewrite rule the request matched.
  63       *
  64       * @since 2.0.0
  65       * @var string
  66       */
  67      public $matched_rule = '';
  68  
  69      /**
  70       * Rewrite query the request matched.
  71       *
  72       * @since 2.0.0
  73       * @var string
  74       */
  75      public $matched_query = '';
  76  
  77      /**
  78       * Whether already did the permalink.
  79       *
  80       * @since 2.0.0
  81       * @var bool
  82       */
  83      public $did_permalink = false;
  84  
  85      /**
  86       * Adds a query variable to the list of public query variables.
  87       *
  88       * @since 2.1.0
  89       *
  90       * @param string $qv Query variable name.
  91       */
  92  	public function add_query_var( $qv ) {
  93          if ( ! in_array( $qv, $this->public_query_vars, true ) ) {
  94              $this->public_query_vars[] = $qv;
  95          }
  96      }
  97  
  98      /**
  99       * Removes a query variable from a list of public query variables.
 100       *
 101       * @since 4.5.0
 102       *
 103       * @param string $name Query variable name.
 104       */
 105  	public function remove_query_var( $name ) {
 106          $this->public_query_vars = array_diff( $this->public_query_vars, array( $name ) );
 107      }
 108  
 109      /**
 110       * Sets the value of a query variable.
 111       *
 112       * @since 2.3.0
 113       *
 114       * @param string $key   Query variable name.
 115       * @param mixed  $value Query variable value.
 116       */
 117  	public function set_query_var( $key, $value ) {
 118          $this->query_vars[ $key ] = $value;
 119      }
 120  
 121      /**
 122       * Parses the request to find the correct WordPress query.
 123       *
 124       * Sets up the query variables based on the request. There are also many
 125       * filters and actions that can be used to further manipulate the result.
 126       *
 127       * @since 2.0.0
 128       * @since 6.0.0 A return value was added.
 129       *
 130       * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 131       *
 132       * @param array|string $extra_query_vars Set the extra query variables.
 133       * @return bool Whether the request was parsed.
 134       */
 135  	public function parse_request( $extra_query_vars = '' ) {
 136          global $wp_rewrite;
 137  
 138          /**
 139           * Filters whether to parse the request.
 140           *
 141           * @since 3.5.0
 142           *
 143           * @param bool         $bool             Whether or not to parse the request. Default true.
 144           * @param WP           $wp               Current WordPress environment instance.
 145           * @param array|string $extra_query_vars Extra passed query variables.
 146           */
 147          if ( ! apply_filters( 'do_parse_request', true, $this, $extra_query_vars ) ) {
 148              return false;
 149          }
 150  
 151          $this->query_vars     = array();
 152          $post_type_query_vars = array();
 153  
 154          if ( is_array( $extra_query_vars ) ) {
 155              $this->extra_query_vars = & $extra_query_vars;
 156          } elseif ( ! empty( $extra_query_vars ) ) {
 157              parse_str( $extra_query_vars, $this->extra_query_vars );
 158          }
 159          // Process PATH_INFO, REQUEST_URI, and 404 for permalinks.
 160  
 161          // Fetch the rewrite rules.
 162          $rewrite = $wp_rewrite->wp_rewrite_rules();
 163  
 164          if ( ! empty( $rewrite ) ) {
 165              // If we match a rewrite rule, this will be cleared.
 166              $error               = '404';
 167              $this->did_permalink = true;
 168  
 169              $pathinfo         = isset( $_SERVER['PATH_INFO'] ) ? $_SERVER['PATH_INFO'] : '';
 170              list( $pathinfo ) = explode( '?', $pathinfo );
 171              $pathinfo         = str_replace( '%', '%25', $pathinfo );
 172  
 173              list( $req_uri ) = explode( '?', $_SERVER['REQUEST_URI'] );
 174              $self            = $_SERVER['PHP_SELF'];
 175  
 176              $home_path       = parse_url( home_url(), PHP_URL_PATH );
 177              $home_path_regex = '';
 178              if ( is_string( $home_path ) && '' !== $home_path ) {
 179                  $home_path       = trim( $home_path, '/' );
 180                  $home_path_regex = sprintf( '|^%s|i', preg_quote( $home_path, '|' ) );
 181              }
 182  
 183              /*
 184               * Trim path info from the end and the leading home path from the front.
 185               * For path info requests, this leaves us with the requesting filename, if any.
 186               * For 404 requests, this leaves us with the requested permalink.
 187               */
 188              $req_uri  = str_replace( $pathinfo, '', $req_uri );
 189              $req_uri  = trim( $req_uri, '/' );
 190              $pathinfo = trim( $pathinfo, '/' );
 191              $self     = trim( $self, '/' );
 192  
 193              if ( ! empty( $home_path_regex ) ) {
 194                  $req_uri  = preg_replace( $home_path_regex, '', $req_uri );
 195                  $req_uri  = trim( $req_uri, '/' );
 196                  $pathinfo = preg_replace( $home_path_regex, '', $pathinfo );
 197                  $pathinfo = trim( $pathinfo, '/' );
 198                  $self     = preg_replace( $home_path_regex, '', $self );
 199                  $self     = trim( $self, '/' );
 200              }
 201  
 202              // The requested permalink is in $pathinfo for path info requests and
 203              // $req_uri for other requests.
 204              if ( ! empty( $pathinfo ) && ! preg_match( '|^.*' . $wp_rewrite->index . '$|', $pathinfo ) ) {
 205                  $requested_path = $pathinfo;
 206              } else {
 207                  // If the request uri is the index, blank it out so that we don't try to match it against a rule.
 208                  if ( $req_uri == $wp_rewrite->index ) {
 209                      $req_uri = '';
 210                  }
 211                  $requested_path = $req_uri;
 212              }
 213              $requested_file = $req_uri;
 214  
 215              $this->request = $requested_path;
 216  
 217              // Look for matches.
 218              $request_match = $requested_path;
 219              if ( empty( $request_match ) ) {
 220                  // An empty request could only match against ^$ regex.
 221                  if ( isset( $rewrite['$'] ) ) {
 222                      $this->matched_rule = '$';
 223                      $query              = $rewrite['$'];
 224                      $matches            = array( '' );
 225                  }
 226              } else {
 227                  foreach ( (array) $rewrite as $match => $query ) {
 228                      // If the requested file is the anchor of the match, prepend it to the path info.
 229                      if ( ! empty( $requested_file ) && strpos( $match, $requested_file ) === 0 && $requested_file != $requested_path ) {
 230                          $request_match = $requested_file . '/' . $requested_path;
 231                      }
 232  
 233                      if ( preg_match( "#^$match#", $request_match, $matches ) ||
 234                          preg_match( "#^$match#", urldecode( $request_match ), $matches ) ) {
 235  
 236                          if ( $wp_rewrite->use_verbose_page_rules && preg_match( '/pagename=\$matches\[([0-9]+)\]/', $query, $varmatch ) ) {
 237                              // This is a verbose page match, let's check to be sure about it.
 238                              $page = get_page_by_path( $matches[ $varmatch[1] ] );
 239                              if ( ! $page ) {
 240                                  continue;
 241                              }
 242  
 243                              $post_status_obj = get_post_status_object( $page->post_status );
 244                              if ( ! $post_status_obj->public && ! $post_status_obj->protected
 245                                  && ! $post_status_obj->private && $post_status_obj->exclude_from_search ) {
 246                                  continue;
 247                              }
 248                          }
 249  
 250                          // Got a match.
 251                          $this->matched_rule = $match;
 252                          break;
 253                      }
 254                  }
 255              }
 256  
 257              if ( ! empty( $this->matched_rule ) ) {
 258                  // Trim the query of everything up to the '?'.
 259                  $query = preg_replace( '!^.+\?!', '', $query );
 260  
 261                  // Substitute the substring matches into the query.
 262                  $query = addslashes( WP_MatchesMapRegex::apply( $query, $matches ) );
 263  
 264                  $this->matched_query = $query;
 265  
 266                  // Parse the query.
 267                  parse_str( $query, $perma_query_vars );
 268  
 269                  // If we're processing a 404 request, clear the error var since we found something.
 270                  if ( '404' == $error ) {
 271                      unset( $error, $_GET['error'] );
 272                  }
 273              }
 274  
 275              // If req_uri is empty or if it is a request for ourself, unset error.
 276              if ( empty( $requested_path ) || $requested_file == $self || strpos( $_SERVER['PHP_SELF'], 'wp-admin/' ) !== false ) {
 277                  unset( $error, $_GET['error'] );
 278  
 279                  if ( isset( $perma_query_vars ) && strpos( $_SERVER['PHP_SELF'], 'wp-admin/' ) !== false ) {
 280                      unset( $perma_query_vars );
 281                  }
 282  
 283                  $this->did_permalink = false;
 284              }
 285          }
 286  
 287          /**
 288           * Filters the query variables allowed before processing.
 289           *
 290           * Allows (publicly allowed) query vars to be added, removed, or changed prior
 291           * to executing the query. Needed to allow custom rewrite rules using your own arguments
 292           * to work, or any other custom query variables you want to be publicly available.
 293           *
 294           * @since 1.5.0
 295           *
 296           * @param string[] $public_query_vars The array of allowed query variable names.
 297           */
 298          $this->public_query_vars = apply_filters( 'query_vars', $this->public_query_vars );
 299  
 300          foreach ( get_post_types( array(), 'objects' ) as $post_type => $t ) {
 301              if ( is_post_type_viewable( $t ) && $t->query_var ) {
 302                  $post_type_query_vars[ $t->query_var ] = $post_type;
 303              }
 304          }
 305  
 306          foreach ( $this->public_query_vars as $wpvar ) {
 307              if ( isset( $this->extra_query_vars[ $wpvar ] ) ) {
 308                  $this->query_vars[ $wpvar ] = $this->extra_query_vars[ $wpvar ];
 309              } elseif ( isset( $_GET[ $wpvar ] ) && isset( $_POST[ $wpvar ] ) && $_GET[ $wpvar ] !== $_POST[ $wpvar ] ) {
 310                  wp_die( __( 'A variable mismatch has been detected.' ), __( 'Sorry, you are not allowed to view this item.' ), 400 );
 311              } elseif ( isset( $_POST[ $wpvar ] ) ) {
 312                  $this->query_vars[ $wpvar ] = $_POST[ $wpvar ];
 313              } elseif ( isset( $_GET[ $wpvar ] ) ) {
 314                  $this->query_vars[ $wpvar ] = $_GET[ $wpvar ];
 315              } elseif ( isset( $perma_query_vars[ $wpvar ] ) ) {
 316                  $this->query_vars[ $wpvar ] = $perma_query_vars[ $wpvar ];
 317              }
 318  
 319              if ( ! empty( $this->query_vars[ $wpvar ] ) ) {
 320                  if ( ! is_array( $this->query_vars[ $wpvar ] ) ) {
 321                      $this->query_vars[ $wpvar ] = (string) $this->query_vars[ $wpvar ];
 322                  } else {
 323                      foreach ( $this->query_vars[ $wpvar ] as $vkey => $v ) {
 324                          if ( is_scalar( $v ) ) {
 325                              $this->query_vars[ $wpvar ][ $vkey ] = (string) $v;
 326                          }
 327                      }
 328                  }
 329  
 330                  if ( isset( $post_type_query_vars[ $wpvar ] ) ) {
 331                      $this->query_vars['post_type'] = $post_type_query_vars[ $wpvar ];
 332                      $this->query_vars['name']      = $this->query_vars[ $wpvar ];
 333                  }
 334              }
 335          }
 336  
 337          // Convert urldecoded spaces back into '+'.
 338          foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy => $t ) {
 339              if ( $t->query_var && isset( $this->query_vars[ $t->query_var ] ) ) {
 340                  $this->query_vars[ $t->query_var ] = str_replace( ' ', '+', $this->query_vars[ $t->query_var ] );
 341              }
 342          }
 343  
 344          // Don't allow non-publicly queryable taxonomies to be queried from the front end.
 345          if ( ! is_admin() ) {
 346              foreach ( get_taxonomies( array( 'publicly_queryable' => false ), 'objects' ) as $taxonomy => $t ) {
 347                  /*
 348                   * Disallow when set to the 'taxonomy' query var.
 349                   * Non-publicly queryable taxonomies cannot register custom query vars. See register_taxonomy().
 350                   */
 351                  if ( isset( $this->query_vars['taxonomy'] ) && $taxonomy === $this->query_vars['taxonomy'] ) {
 352                      unset( $this->query_vars['taxonomy'], $this->query_vars['term'] );
 353                  }
 354              }
 355          }
 356  
 357          // Limit publicly queried post_types to those that are 'publicly_queryable'.
 358          if ( isset( $this->query_vars['post_type'] ) ) {
 359              $queryable_post_types = get_post_types( array( 'publicly_queryable' => true ) );
 360              if ( ! is_array( $this->query_vars['post_type'] ) ) {
 361                  if ( ! in_array( $this->query_vars['post_type'], $queryable_post_types, true ) ) {
 362                      unset( $this->query_vars['post_type'] );
 363                  }
 364              } else {
 365                  $this->query_vars['post_type'] = array_intersect( $this->query_vars['post_type'], $queryable_post_types );
 366              }
 367          }
 368  
 369          // Resolve conflicts between posts with numeric slugs and date archive queries.
 370          $this->query_vars = wp_resolve_numeric_slug_conflicts( $this->query_vars );
 371  
 372          foreach ( (array) $this->private_query_vars as $var ) {
 373              if ( isset( $this->extra_query_vars[ $var ] ) ) {
 374                  $this->query_vars[ $var ] = $this->extra_query_vars[ $var ];
 375              }
 376          }
 377  
 378          if ( isset( $error ) ) {
 379              $this->query_vars['error'] = $error;
 380          }
 381  
 382          /**
 383           * Filters the array of parsed query variables.
 384           *
 385           * @since 2.1.0
 386           *
 387           * @param array $query_vars The array of requested query variables.
 388           */
 389          $this->query_vars = apply_filters( 'request', $this->query_vars );
 390  
 391          /**
 392           * Fires once all query variables for the current request have been parsed.
 393           *
 394           * @since 2.1.0
 395           *
 396           * @param WP $wp Current WordPress environment instance (passed by reference).
 397           */
 398          do_action_ref_array( 'parse_request', array( &$this ) );
 399  
 400          return true;
 401      }
 402  
 403      /**
 404       * Sends additional HTTP headers for caching, content type, etc.
 405       *
 406       * Sets the Content-Type header. Sets the 'error' status (if passed) and optionally exits.
 407       * If showing a feed, it will also send Last-Modified, ETag, and 304 status if needed.
 408       *
 409       * @since 2.0.0
 410       * @since 4.4.0 `X-Pingback` header is added conditionally after posts have been queried in handle_404().
 411       */
 412  	public function send_headers() {
 413          $headers       = array();
 414          $status        = null;
 415          $exit_required = false;
 416          $date_format   = 'D, d M Y H:i:s';
 417  
 418          if ( is_user_logged_in() ) {
 419              $headers = array_merge( $headers, wp_get_nocache_headers() );
 420          } elseif ( ! empty( $_GET['unapproved'] ) && ! empty( $_GET['moderation-hash'] ) ) {
 421              // Unmoderated comments are only visible for 10 minutes via the moderation hash.
 422              $expires = 10 * MINUTE_IN_SECONDS;
 423  
 424              $headers['Expires']       = gmdate( $date_format, time() + $expires );
 425              $headers['Cache-Control'] = sprintf(
 426                  'max-age=%d, must-revalidate',
 427                  $expires
 428              );
 429          }
 430          if ( ! empty( $this->query_vars['error'] ) ) {
 431              $status = (int) $this->query_vars['error'];
 432              if ( 404 === $status ) {
 433                  if ( ! is_user_logged_in() ) {
 434                      $headers = array_merge( $headers, wp_get_nocache_headers() );
 435                  }
 436                  $headers['Content-Type'] = get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' );
 437              } elseif ( in_array( $status, array( 403, 500, 502, 503 ), true ) ) {
 438                  $exit_required = true;
 439              }
 440          } elseif ( empty( $this->query_vars['feed'] ) ) {
 441              $headers['Content-Type'] = get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' );
 442          } else {
 443              // Set the correct content type for feeds.
 444              $type = $this->query_vars['feed'];
 445              if ( 'feed' === $this->query_vars['feed'] ) {
 446                  $type = get_default_feed();
 447              }
 448              $headers['Content-Type'] = feed_content_type( $type ) . '; charset=' . get_option( 'blog_charset' );
 449  
 450              // We're showing a feed, so WP is indeed the only thing that last changed.
 451              if ( ! empty( $this->query_vars['withcomments'] )
 452                  || false !== strpos( $this->query_vars['feed'], 'comments-' )
 453                  || ( empty( $this->query_vars['withoutcomments'] )
 454                      && ( ! empty( $this->query_vars['p'] )
 455                          || ! empty( $this->query_vars['name'] )
 456                          || ! empty( $this->query_vars['page_id'] )
 457                          || ! empty( $this->query_vars['pagename'] )
 458                          || ! empty( $this->query_vars['attachment'] )
 459                          || ! empty( $this->query_vars['attachment_id'] )
 460                      )
 461                  )
 462              ) {
 463                  $wp_last_modified_post    = mysql2date( $date_format, get_lastpostmodified( 'GMT' ), false );
 464                  $wp_last_modified_comment = mysql2date( $date_format, get_lastcommentmodified( 'GMT' ), false );
 465                  if ( strtotime( $wp_last_modified_post ) > strtotime( $wp_last_modified_comment ) ) {
 466                      $wp_last_modified = $wp_last_modified_post;
 467                  } else {
 468                      $wp_last_modified = $wp_last_modified_comment;
 469                  }
 470              } else {
 471                  $wp_last_modified = mysql2date( $date_format, get_lastpostmodified( 'GMT' ), false );
 472              }
 473  
 474              if ( ! $wp_last_modified ) {
 475                  $wp_last_modified = gmdate( $date_format );
 476              }
 477  
 478              $wp_last_modified .= ' GMT';
 479  
 480              $wp_etag                  = '"' . md5( $wp_last_modified ) . '"';
 481              $headers['Last-Modified'] = $wp_last_modified;
 482              $headers['ETag']          = $wp_etag;
 483  
 484              // Support for conditional GET.
 485              if ( isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ) {
 486                  $client_etag = wp_unslash( $_SERVER['HTTP_IF_NONE_MATCH'] );
 487              } else {
 488                  $client_etag = false;
 489              }
 490  
 491              $client_last_modified = empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ? '' : trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
 492              // If string is empty, return 0. If not, attempt to parse into a timestamp.
 493              $client_modified_timestamp = $client_last_modified ? strtotime( $client_last_modified ) : 0;
 494  
 495              // Make a timestamp for our most recent modification..
 496              $wp_modified_timestamp = strtotime( $wp_last_modified );
 497  
 498              if ( ( $client_last_modified && $client_etag ) ?
 499                      ( ( $client_modified_timestamp >= $wp_modified_timestamp ) && ( $client_etag == $wp_etag ) ) :
 500                      ( ( $client_modified_timestamp >= $wp_modified_timestamp ) || ( $client_etag == $wp_etag ) ) ) {
 501                  $status        = 304;
 502                  $exit_required = true;
 503              }
 504          }
 505  
 506          /**
 507           * Filters the HTTP headers before they're sent to the browser.
 508           *
 509           * @since 2.8.0
 510           *
 511           * @param string[] $headers Associative array of headers to be sent.
 512           * @param WP       $wp      Current WordPress environment instance.
 513           */
 514          $headers = apply_filters( 'wp_headers', $headers, $this );
 515  
 516          if ( ! empty( $status ) ) {
 517              status_header( $status );
 518          }
 519  
 520          // If Last-Modified is set to false, it should not be sent (no-cache situation).
 521          if ( isset( $headers['Last-Modified'] ) && false === $headers['Last-Modified'] ) {
 522              unset( $headers['Last-Modified'] );
 523  
 524              if ( ! headers_sent() ) {
 525                  header_remove( 'Last-Modified' );
 526              }
 527          }
 528  
 529          if ( ! headers_sent() ) {
 530              foreach ( (array) $headers as $name => $field_value ) {
 531                  header( "{$name}: {$field_value}" );
 532              }
 533          }
 534  
 535          if ( $exit_required ) {
 536              exit;
 537          }
 538  
 539          /**
 540           * Fires once the requested HTTP headers for caching, content type, etc. have been sent.
 541           *
 542           * @since 2.1.0
 543           *
 544           * @param WP $wp Current WordPress environment instance (passed by reference).
 545           */
 546          do_action_ref_array( 'send_headers', array( &$this ) );
 547      }
 548  
 549      /**
 550       * Sets the query string property based off of the query variable property.
 551       *
 552       * The {@see 'query_string'} filter is deprecated, but still works. Plugins should
 553       * use the {@see 'request'} filter instead.
 554       *
 555       * @since 2.0.0
 556       */
 557  	public function build_query_string() {
 558          $this->query_string = '';
 559          foreach ( (array) array_keys( $this->query_vars ) as $wpvar ) {
 560              if ( '' != $this->query_vars[ $wpvar ] ) {
 561                  $this->query_string .= ( strlen( $this->query_string ) < 1 ) ? '' : '&';
 562                  if ( ! is_scalar( $this->query_vars[ $wpvar ] ) ) { // Discard non-scalars.
 563                      continue;
 564                  }
 565                  $this->query_string .= $wpvar . '=' . rawurlencode( $this->query_vars[ $wpvar ] );
 566              }
 567          }
 568  
 569          if ( has_filter( 'query_string' ) ) {  // Don't bother filtering and parsing if no plugins are hooked in.
 570              /**
 571               * Filters the query string before parsing.
 572               *
 573               * @since 1.5.0
 574               * @deprecated 2.1.0 Use {@see 'query_vars'} or {@see 'request'} filters instead.
 575               *
 576               * @param string $query_string The query string to modify.
 577               */
 578              $this->query_string = apply_filters_deprecated(
 579                  'query_string',
 580                  array( $this->query_string ),
 581                  '2.1.0',
 582                  'query_vars, request'
 583              );
 584              parse_str( $this->query_string, $this->query_vars );
 585          }
 586      }
 587  
 588      /**
 589       * Set up the WordPress Globals.
 590       *
 591       * The query_vars property will be extracted to the GLOBALS. So care should
 592       * be taken when naming global variables that might interfere with the
 593       * WordPress environment.
 594       *
 595       * @since 2.0.0
 596       *
 597       * @global WP_Query     $wp_query     WordPress Query object.
 598       * @global string       $query_string Query string for the loop.
 599       * @global array        $posts        The found posts.
 600       * @global WP_Post|null $post         The current post, if available.
 601       * @global string       $request      The SQL statement for the request.
 602       * @global int          $more         Only set, if single page or post.
 603       * @global int          $single       If single page or post. Only set, if single page or post.
 604       * @global WP_User      $authordata   Only set, if author archive.
 605       */
 606  	public function register_globals() {
 607          global $wp_query;
 608  
 609          // Extract updated query vars back into global namespace.
 610          foreach ( (array) $wp_query->query_vars as $key => $value ) {
 611              $GLOBALS[ $key ] = $value;
 612          }
 613  
 614          $GLOBALS['query_string'] = $this->query_string;
 615          $GLOBALS['posts']        = & $wp_query->posts;
 616          $GLOBALS['post']         = isset( $wp_query->post ) ? $wp_query->post : null;
 617          $GLOBALS['request']      = $wp_query->request;
 618  
 619          if ( $wp_query->is_single() || $wp_query->is_page() ) {
 620              $GLOBALS['more']   = 1;
 621              $GLOBALS['single'] = 1;
 622          }
 623  
 624          if ( $wp_query->is_author() ) {
 625              $GLOBALS['authordata'] = get_userdata( get_queried_object_id() );
 626          }
 627      }
 628  
 629      /**
 630       * Set up the current user.
 631       *
 632       * @since 2.0.0
 633       */
 634  	public function init() {
 635          wp_get_current_user();
 636      }
 637  
 638      /**
 639       * Set up the Loop based on the query variables.
 640       *
 641       * @since 2.0.0
 642       *
 643       * @global WP_Query $wp_the_query WordPress Query object.
 644       */
 645  	public function query_posts() {
 646          global $wp_the_query;
 647          $this->build_query_string();
 648          $wp_the_query->query( $this->query_vars );
 649      }
 650  
 651      /**
 652       * Set the Headers for 404, if nothing is found for requested URL.
 653       *
 654       * Issue a 404 if a request doesn't match any posts and doesn't match any object
 655       * (e.g. an existing-but-empty category, tag, author) and a 404 was not already issued,
 656       * and if the request was not a search or the homepage.
 657       *
 658       * Otherwise, issue a 200.
 659       *
 660       * This sets headers after posts have been queried. handle_404() really means "handle status".
 661       * By inspecting the result of querying posts, seemingly successful requests can be switched to
 662       * a 404 so that canonical redirection logic can kick in.
 663       *
 664       * @since 2.0.0
 665       *
 666       * @global WP_Query $wp_query WordPress Query object.
 667       */
 668  	public function handle_404() {
 669          global $wp_query;
 670  
 671          /**
 672           * Filters whether to short-circuit default header status handling.
 673           *
 674           * Returning a non-false value from the filter will short-circuit the handling
 675           * and return early.
 676           *
 677           * @since 4.5.0
 678           *
 679           * @param bool     $preempt  Whether to short-circuit default header status handling. Default false.
 680           * @param WP_Query $wp_query WordPress Query object.
 681           */
 682          if ( false !== apply_filters( 'pre_handle_404', false, $wp_query ) ) {
 683              return;
 684          }
 685  
 686          // If we've already issued a 404, bail.
 687          if ( is_404() ) {
 688              return;
 689          }
 690  
 691          $set_404 = true;
 692  
 693          // Never 404 for the admin, robots, or favicon.
 694          if ( is_admin() || is_robots() || is_favicon() ) {
 695              $set_404 = false;
 696  
 697              // If posts were found, check for paged content.
 698          } elseif ( $wp_query->posts ) {
 699              $content_found = true;
 700  
 701              if ( is_singular() ) {
 702                  $post = isset( $wp_query->post ) ? $wp_query->post : null;
 703  
 704                  // Only set X-Pingback for single posts that allow pings.
 705                  if ( $post && pings_open( $post ) && ! headers_sent() ) {
 706                      header( 'X-Pingback: ' . get_bloginfo( 'pingback_url', 'display' ) );
 707                  }
 708  
 709                  // Check for paged content that exceeds the max number of pages.
 710                  $next = '<!--nextpage-->';
 711                  if ( $post && ! empty( $this->query_vars['page'] ) ) {
 712                      // Check if content is actually intended to be paged.
 713                      if ( false !== strpos( $post->post_content, $next ) ) {
 714                          $page          = trim( $this->query_vars['page'], '/' );
 715                          $content_found = (int) $page <= ( substr_count( $post->post_content, $next ) + 1 );
 716                      } else {
 717                          $content_found = false;
 718                      }
 719                  }
 720              }
 721  
 722              // The posts page does not support the <!--nextpage--> pagination.
 723              if ( $wp_query->is_posts_page && ! empty( $this->query_vars['page'] ) ) {
 724                  $content_found = false;
 725              }
 726  
 727              if ( $content_found ) {
 728                  $set_404 = false;
 729              }
 730  
 731              // We will 404 for paged queries, as no posts were found.
 732          } elseif ( ! is_paged() ) {
 733              $author = get_query_var( 'author' );
 734  
 735              // Don't 404 for authors without posts as long as they matched an author on this site.
 736              if ( is_author() && is_numeric( $author ) && $author > 0 && is_user_member_of_blog( $author )
 737                  // Don't 404 for these queries if they matched an object.
 738                  || ( is_tag() || is_category() || is_tax() || is_post_type_archive() ) && get_queried_object()
 739                  // Don't 404 for these queries either.
 740                  || is_home() || is_search() || is_feed()
 741              ) {
 742                  $set_404 = false;
 743              }
 744          }
 745  
 746          if ( $set_404 ) {
 747              // Guess it's time to 404.
 748              $wp_query->set_404();
 749              status_header( 404 );
 750              nocache_headers();
 751          } else {
 752              status_header( 200 );
 753          }
 754      }
 755  
 756      /**
 757       * Sets up all of the variables required by the WordPress environment.
 758       *
 759       * The action {@see 'wp'} has one parameter that references the WP object. It
 760       * allows for accessing the properties and methods to further manipulate the
 761       * object.
 762       *
 763       * @since 2.0.0
 764       *
 765       * @param string|array $query_args Passed to parse_request().
 766       */
 767  	public function main( $query_args = '' ) {
 768          $this->init();
 769  
 770          $parsed = $this->parse_request( $query_args );
 771  
 772          $this->send_headers();
 773  
 774          if ( $parsed ) {
 775              $this->query_posts();
 776              $this->handle_404();
 777              $this->register_globals();
 778          }
 779  
 780          /**
 781           * Fires once the WordPress environment has been set up.
 782           *
 783           * @since 2.1.0
 784           *
 785           * @param WP $wp Current WordPress environment instance (passed by reference).
 786           */
 787          do_action_ref_array( 'wp', array( &$this ) );
 788      }
 789  }


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