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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 388 | |
| 389 | if ( ! empty($qv['robots']) ) { |
| 390 | $this->is_robots = true; |
| 391 | return; |
| 392 | } |
| 393 | |
| 394 | if ('404' == $qv['error']) { |
| 395 | $this->is_404 = true; |
| 396 | if ( !empty($query) ) { |
| 397 | do_action_ref_array('parse_query', array(&$this)); |
| 398 | } |
| 399 | return; |
| 400 | } |
| 401 | |
| 402 | $qv['m'] = (int) $qv['m']; |
| 403 | $qv['p'] = (int) $qv['p']; |
| 404 | |
| 405 | // Compat. Map subpost to attachment. |
| 406 | if ( '' != $qv['subpost'] ) |
| Line | Code |
| 536 | |
| 537 | if ( $this->is_single || $this->is_page || $this->is_attachment ) |
| 538 | $this->is_singular = true; |
| 539 | |
| 540 | if ( ! ($this->is_singular || $this->is_archive || $this->is_search || $this->is_feed || $this->is_trackback || $this->is_404 || $this->is_admin || $this->is_comments_popup)) { |
| 541 | $this->is_home = true; |
| 542 | } |
| 543 | |
| 544 | if ( !empty($query) ) { |
| 545 | do_action_ref_array('parse_query', array(&$this)); |
| 546 | } |
| 547 | } |
| 548 | |
| 549 | function set_404() { |
| 550 | $is_feed = $this->is_feed; |
| 551 | |
| 552 | $this->init_query_flags(); |
| 553 | $this->is_404 = true; |
| 554 | |