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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 |
|---|---|
| 4642 | // $args can be whatever, only use the args defined in defaults to compute the key. |
| 4643 | $key = md5( serialize( wp_array_slice_assoc( $r, array_keys( $defaults ) ) ) ); |
| 4644 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
| 4645 | |
| 4646 | $cache_key = "get_pages:$key:$last_changed"; |
| 4647 | if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) { |
| 4648 | // Convert to WP_Post instances. |
| 4649 | $pages = array_map( 'get_post', $cache ); |
| 4650 | /** This filter is documented in wp-includes/post.php */ |
| 4651 | $pages = apply_filters( 'get_pages', $pages, $r ); |
| 4652 | return $pages; |
| 4653 | } |
| 4654 | |
| 4655 | $inclusions = ''; |
| 4656 | if ( ! empty( $r['include'] ) ) { |
| 4657 | $child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include |
| 4658 | $parent = -1; |
| 4659 | $exclude = ''; |
| 4660 | $meta_key = ''; |
| Line | Code |
| 4784 | |
| 4785 | if ( ! empty( $number ) ) { |
| 4786 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 4787 | } |
| 4788 | |
| 4789 | $pages = $wpdb->get_results($query); |
| 4790 | |
| 4791 | if ( empty($pages) ) { |
| 4792 | /** This filter is documented in wp-includes/post.php */ |
| 4793 | $pages = apply_filters( 'get_pages', array(), $r ); |
| 4794 | return $pages; |
| 4795 | } |
| 4796 | |
| 4797 | // Sanitize before caching so it'll only get done once. |
| 4798 | $num_pages = count($pages); |
| 4799 | for ($i = 0; $i < $num_pages; $i++) { |
| 4800 | $pages[$i] = sanitize_post($pages[$i], 'raw'); |
| 4801 | } |
| 4802 | |
| Line | Code |
| 4836 | |
| 4837 | /** |
| 4838 | * Filters the retrieved list of pages. |
| 4839 | * |
| 4840 | * @since 2.1.0 |
| 4841 | * |
| 4842 | * @param array $pages List of pages to retrieve. |
| 4843 | * @param array $r Array of get_pages() arguments. |
| 4844 | */ |
| 4845 | return apply_filters( 'get_pages', $pages, $r ); |
| 4846 | } |
| 4847 | |
| 4848 | // |
| 4849 | // Attachment functions |
| 4850 | // |
| 4851 | |
| 4852 | /** |
| 4853 | * Check if the attachment URI is local one and is really an attachment. |
| 4854 | * |