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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 3 times in this file.
| Line | Code |
|---|---|
| 4590 | $last_changed = microtime(); |
| 4591 | wp_cache_set( 'last_changed', $last_changed, 'posts' ); |
| 4592 | } |
| 4593 | |
| 4594 | $cache_key = "get_pages:$key:$last_changed"; |
| 4595 | if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) { |
| 4596 | // Convert to WP_Post instances. |
| 4597 | $pages = array_map( 'get_post', $cache ); |
| 4598 | /** This filter is documented in wp-includes/post.php */ |
| 4599 | $pages = apply_filters( 'get_pages', $pages, $r ); |
| 4600 | return $pages; |
| 4601 | } |
| 4602 | |
| 4603 | $inclusions = ''; |
| 4604 | if ( ! empty( $r['include'] ) ) { |
| 4605 | $child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include |
| 4606 | $parent = -1; |
| 4607 | $exclude = ''; |
| 4608 | $meta_key = ''; |
| Line | Code |
| 4732 | |
| 4733 | if ( ! empty( $number ) ) { |
| 4734 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 4735 | } |
| 4736 | |
| 4737 | $pages = $wpdb->get_results($query); |
| 4738 | |
| 4739 | if ( empty($pages) ) { |
| 4740 | /** This filter is documented in wp-includes/post.php */ |
| 4741 | $pages = apply_filters( 'get_pages', array(), $r ); |
| 4742 | return $pages; |
| 4743 | } |
| 4744 | |
| 4745 | // Sanitize before caching so it'll only get done once. |
| 4746 | $num_pages = count($pages); |
| 4747 | for ($i = 0; $i < $num_pages; $i++) { |
| 4748 | $pages[$i] = sanitize_post($pages[$i], 'raw'); |
| 4749 | } |
| 4750 | |
| Line | Code |
| 4784 | |
| 4785 | /** |
| 4786 | * Filter the retrieved list of pages. |
| 4787 | * |
| 4788 | * @since 2.1.0 |
| 4789 | * |
| 4790 | * @param array $pages List of pages to retrieve. |
| 4791 | * @param array $r Array of get_pages() arguments. |
| 4792 | */ |
| 4793 | return apply_filters( 'get_pages', $pages, $r ); |
| 4794 | } |
| 4795 | |
| 4796 | // |
| 4797 | // Attachment functions |
| 4798 | // |
| 4799 | |
| 4800 | /** |
| 4801 | * Check if the attachment URI is local one and is really an attachment. |
| 4802 | * |