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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.
| Line | Code |
|---|---|
| 1570 | if ( is_array( $struct ) ) { |
| 1571 | if ( count( $struct ) == 2 ) |
| 1572 | $rules = $this->generate_rewrite_rules( $struct[0], $struct[1] ); |
| 1573 | else |
| 1574 | $rules = $this->generate_rewrite_rules( $struct['struct'], $struct['ep_mask'], $struct['paged'], $struct['feed'], $struct['forcomments'], $struct['walk_dirs'], $struct['endpoints'] ); |
| 1575 | } else { |
| 1576 | $rules = $this->generate_rewrite_rules( $struct ); |
| 1577 | } |
| 1578 | |
| 1579 | $rules = apply_filters($permastructname . '_rewrite_rules', $rules); |
| 1580 | if ( 'post_tag' == $permastructname ) |
| 1581 | $rules = apply_filters('tag_rewrite_rules', $rules); |
| 1582 | |
| 1583 | $this->extra_rules_top = array_merge($this->extra_rules_top, $rules); |
| 1584 | } |
| 1585 | |
| 1586 | // Put them together. |
| 1587 | if ( $this->use_verbose_page_rules ) |
| 1588 | $this->rules = array_merge($this->extra_rules_top, $robots_rewrite, $old_feed_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $page_rewrite, $post_rewrite, $this->extra_rules); |