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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 |
|---|---|
| 5566 | $key = md5( serialize( wp_array_slice_assoc( $parsed_args, array_keys( $defaults ) ) ) ); |
| 5567 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
| 5568 | |
| 5569 | $cache_key = "get_pages:$key:$last_changed"; |
| 5570 | $cache = wp_cache_get( $cache_key, 'posts' ); |
| 5571 | if ( false !== $cache ) { |
| 5572 | // Convert to WP_Post instances. |
| 5573 | $pages = array_map( 'get_post', $cache ); |
| 5574 | /** This filter is documented in wp-includes/post.php */ |
| 5575 | $pages = apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5576 | return $pages; |
| 5577 | } |
| 5578 | |
| 5579 | $inclusions = ''; |
| 5580 | if ( ! empty( $parsed_args['include'] ) ) { |
| 5581 | $child_of = 0; // Ignore child_of, parent, exclude, meta_key, and meta_value params if using include. |
| 5582 | $parent = -1; |
| 5583 | $exclude = ''; |
| 5584 | $meta_key = ''; |
| Line | Code |
| 5726 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 5727 | } |
| 5728 | |
| 5729 | $pages = $wpdb->get_results( $query ); |
| 5730 | |
| 5731 | if ( empty( $pages ) ) { |
| 5732 | wp_cache_set( $cache_key, array(), 'posts' ); |
| 5733 | |
| 5734 | /** This filter is documented in wp-includes/post.php */ |
| 5735 | $pages = apply_filters( 'get_pages', array(), $parsed_args ); |
| 5736 | return $pages; |
| 5737 | } |
| 5738 | |
| 5739 | // Sanitize before caching so it'll only get done once. |
| 5740 | $num_pages = count( $pages ); |
| 5741 | for ( $i = 0; $i < $num_pages; $i++ ) { |
| 5742 | $pages[ $i ] = sanitize_post( $pages[ $i ], 'raw' ); |
| 5743 | } |
| 5744 | |
| Line | Code |
| 5778 | |
| 5779 | /** |
| 5780 | * Filters the retrieved list of pages. |
| 5781 | * |
| 5782 | * @since 2.1.0 |
| 5783 | * |
| 5784 | * @param WP_Post[] $pages Array of page objects. |
| 5785 | * @param array $parsed_args Array of get_pages() arguments. |
| 5786 | */ |
| 5787 | return apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5788 | } |
| 5789 | |
| 5790 | // |
| 5791 | // Attachment functions. |
| 5792 | // |
| 5793 | |
| 5794 | /** |
| 5795 | * Determines whether an attachment URI is local and really an attachment. |
| 5796 | * |