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