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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 |
|---|---|
| 5783 | |
| 5784 | $cache_key = "get_pages:$key:$last_changed"; |
| 5785 | $cache = wp_cache_get( $cache_key, 'posts' ); |
| 5786 | if ( false !== $cache ) { |
| 5787 | _prime_post_caches( $cache, false, false ); |
| 5788 | |
| 5789 | // Convert to WP_Post instances. |
| 5790 | $pages = array_map( 'get_post', $cache ); |
| 5791 | /** This filter is documented in wp-includes/post.php */ |
| 5792 | $pages = apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5793 | |
| 5794 | return $pages; |
| 5795 | } |
| 5796 | |
| 5797 | $inclusions = ''; |
| 5798 | if ( ! empty( $parsed_args['include'] ) ) { |
| 5799 | $child_of = 0; // Ignore child_of, parent, exclude, meta_key, and meta_value params if using include. |
| 5800 | $parent = -1; |
| 5801 | $exclude = ''; |
| Line | Code |
| 5944 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 5945 | } |
| 5946 | |
| 5947 | $pages = $wpdb->get_results( $query ); |
| 5948 | |
| 5949 | if ( empty( $pages ) ) { |
| 5950 | wp_cache_set( $cache_key, array(), 'posts' ); |
| 5951 | |
| 5952 | /** This filter is documented in wp-includes/post.php */ |
| 5953 | $pages = apply_filters( 'get_pages', array(), $parsed_args ); |
| 5954 | |
| 5955 | return $pages; |
| 5956 | } |
| 5957 | |
| 5958 | // Sanitize before caching so it'll only get done once. |
| 5959 | $num_pages = count( $pages ); |
| 5960 | for ( $i = 0; $i < $num_pages; $i++ ) { |
| 5961 | $pages[ $i ] = sanitize_post( $pages[ $i ], 'raw' ); |
| 5962 | } |
| Line | Code |
| 5997 | |
| 5998 | /** |
| 5999 | * Filters the retrieved list of pages. |
| 6000 | * |
| 6001 | * @since 2.1.0 |
| 6002 | * |
| 6003 | * @param WP_Post[] $pages Array of page objects. |
| 6004 | * @param array $parsed_args Array of get_pages() arguments. |
| 6005 | */ |
| 6006 | return apply_filters( 'get_pages', $pages, $parsed_args ); |
| 6007 | } |
| 6008 | |
| 6009 | // |
| 6010 | // Attachment functions. |
| 6011 | // |
| 6012 | |
| 6013 | /** |
| 6014 | * Determines whether an attachment URI is local and really an attachment. |
| 6015 | * |