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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 |
|---|---|
| 415 | |
| 416 | if ( ! empty($qv['robots']) ) { |
| 417 | $this->is_robots = true; |
| 418 | return; |
| 419 | } |
| 420 | |
| 421 | if ('404' == $qv['error']) { |
| 422 | $this->is_404 = true; |
| 423 | if ( !empty($query) ) { |
| 424 | do_action_ref_array('parse_query', array(&$this)); |
| 425 | } |
| 426 | return; |
| 427 | } |
| 428 | |
| 429 | $qv['p'] = (int) $qv['p']; |
| 430 | $qv['page_id'] = (int) $qv['page_id']; |
| 431 | $qv['year'] = (int) $qv['year']; |
| 432 | $qv['monthnum'] = (int) $qv['monthnum']; |
| 433 | $qv['day'] = (int) $qv['day']; |
| Line | Code |
| 607 | } |
| 608 | |
| 609 | if ( $this->is_posts_page && !$qv['withcomments'] ) |
| 610 | $this->is_comment_feed = false; |
| 611 | |
| 612 | $this->is_singular = $this->is_single || $this->is_page || $this->is_attachment; |
| 613 | // Done correcting is_* for page_on_front and page_for_posts |
| 614 | |
| 615 | if ( !empty($query) ) |
| 616 | do_action_ref_array('parse_query', array(&$this)); |
| 617 | } |
| 618 | |
| 619 | function set_404() { |
| 620 | $is_feed = $this->is_feed; |
| 621 | |
| 622 | $this->init_query_flags(); |
| 623 | $this->is_404 = true; |
| 624 | |
| 625 | $this->is_feed = $is_feed; |