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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 |
|---|---|
| 4549 | $last_changed = microtime(); |
| 4550 | wp_cache_set( 'last_changed', $last_changed, 'posts' ); |
| 4551 | } |
| 4552 | |
| 4553 | $cache_key = "get_pages:$key:$last_changed"; |
| 4554 | if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) { |
| 4555 | // Convert to WP_Post instances. |
| 4556 | $pages = array_map( 'get_post', $cache ); |
| 4557 | /** This filter is documented in wp-includes/post.php */ |
| 4558 | $pages = apply_filters( 'get_pages', $pages, $r ); |
| 4559 | return $pages; |
| 4560 | } |
| 4561 | |
| 4562 | $inclusions = ''; |
| 4563 | if ( ! empty( $r['include'] ) ) { |
| 4564 | $child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include |
| 4565 | $parent = -1; |
| 4566 | $exclude = ''; |
| 4567 | $meta_key = ''; |
| Line | Code |
| 4691 | |
| 4692 | if ( ! empty( $number ) ) { |
| 4693 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 4694 | } |
| 4695 | |
| 4696 | $pages = $wpdb->get_results($query); |
| 4697 | |
| 4698 | if ( empty($pages) ) { |
| 4699 | /** This filter is documented in wp-includes/post.php */ |
| 4700 | $pages = apply_filters( 'get_pages', array(), $r ); |
| 4701 | return $pages; |
| 4702 | } |
| 4703 | |
| 4704 | // Sanitize before caching so it'll only get done once. |
| 4705 | $num_pages = count($pages); |
| 4706 | for ($i = 0; $i < $num_pages; $i++) { |
| 4707 | $pages[$i] = sanitize_post($pages[$i], 'raw'); |
| 4708 | } |
| 4709 | |
| Line | Code |
| 4743 | |
| 4744 | /** |
| 4745 | * Filter the retrieved list of pages. |
| 4746 | * |
| 4747 | * @since 2.1.0 |
| 4748 | * |
| 4749 | * @param array $pages List of pages to retrieve. |
| 4750 | * @param array $r Array of get_pages() arguments. |
| 4751 | */ |
| 4752 | return apply_filters( 'get_pages', $pages, $r ); |
| 4753 | } |
| 4754 | |
| 4755 | // |
| 4756 | // Attachment functions |
| 4757 | // |
| 4758 | |
| 4759 | /** |
| 4760 | * Check if the attachment URI is local one and is really an attachment. |
| 4761 | * |