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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 |
|---|---|
| 5680 | $key = md5( serialize( wp_array_slice_assoc( $parsed_args, array_keys( $defaults ) ) ) ); |
| 5681 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
| 5682 | |
| 5683 | $cache_key = "get_pages:$key:$last_changed"; |
| 5684 | $cache = wp_cache_get( $cache_key, 'posts' ); |
| 5685 | if ( false !== $cache ) { |
| 5686 | // Convert to WP_Post instances. |
| 5687 | $pages = array_map( 'get_post', $cache ); |
| 5688 | /** This filter is documented in wp-includes/post.php */ |
| 5689 | $pages = apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5690 | return $pages; |
| 5691 | } |
| 5692 | |
| 5693 | $inclusions = ''; |
| 5694 | if ( ! empty( $parsed_args['include'] ) ) { |
| 5695 | $child_of = 0; // Ignore child_of, parent, exclude, meta_key, and meta_value params if using include. |
| 5696 | $parent = -1; |
| 5697 | $exclude = ''; |
| 5698 | $meta_key = ''; |
| Line | Code |
| 5840 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 5841 | } |
| 5842 | |
| 5843 | $pages = $wpdb->get_results( $query ); |
| 5844 | |
| 5845 | if ( empty( $pages ) ) { |
| 5846 | wp_cache_set( $cache_key, array(), 'posts' ); |
| 5847 | |
| 5848 | /** This filter is documented in wp-includes/post.php */ |
| 5849 | $pages = apply_filters( 'get_pages', array(), $parsed_args ); |
| 5850 | return $pages; |
| 5851 | } |
| 5852 | |
| 5853 | // Sanitize before caching so it'll only get done once. |
| 5854 | $num_pages = count( $pages ); |
| 5855 | for ( $i = 0; $i < $num_pages; $i++ ) { |
| 5856 | $pages[ $i ] = sanitize_post( $pages[ $i ], 'raw' ); |
| 5857 | } |
| 5858 | |
| Line | Code |
| 5892 | |
| 5893 | /** |
| 5894 | * Filters the retrieved list of pages. |
| 5895 | * |
| 5896 | * @since 2.1.0 |
| 5897 | * |
| 5898 | * @param WP_Post[] $pages Array of page objects. |
| 5899 | * @param array $parsed_args Array of get_pages() arguments. |
| 5900 | */ |
| 5901 | return apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5902 | } |
| 5903 | |
| 5904 | // |
| 5905 | // Attachment functions. |
| 5906 | // |
| 5907 | |
| 5908 | /** |
| 5909 | * Determines whether an attachment URI is local and really an attachment. |
| 5910 | * |