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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 |
|---|---|
| 4398 | $last_changed = microtime(); |
| 4399 | wp_cache_set( 'last_changed', $last_changed, 'posts' ); |
| 4400 | } |
| 4401 | |
| 4402 | $cache_key = "get_pages:$key:$last_changed"; |
| 4403 | if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) { |
| 4404 | // Convert to WP_Post instances. |
| 4405 | $pages = array_map( 'get_post', $cache ); |
| 4406 | /** This filter is documented in wp-includes/post.php */ |
| 4407 | $pages = apply_filters( 'get_pages', $pages, $r ); |
| 4408 | return $pages; |
| 4409 | } |
| 4410 | |
| 4411 | $inclusions = ''; |
| 4412 | if ( ! empty( $r['include'] ) ) { |
| 4413 | $child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include |
| 4414 | $parent = -1; |
| 4415 | $exclude = ''; |
| 4416 | $meta_key = ''; |
| Line | Code |
| 4540 | |
| 4541 | if ( ! empty( $number ) ) { |
| 4542 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 4543 | } |
| 4544 | |
| 4545 | $pages = $wpdb->get_results($query); |
| 4546 | |
| 4547 | if ( empty($pages) ) { |
| 4548 | /** This filter is documented in wp-includes/post.php */ |
| 4549 | $pages = apply_filters( 'get_pages', array(), $r ); |
| 4550 | return $pages; |
| 4551 | } |
| 4552 | |
| 4553 | // Sanitize before caching so it'll only get done once. |
| 4554 | $num_pages = count($pages); |
| 4555 | for ($i = 0; $i < $num_pages; $i++) { |
| 4556 | $pages[$i] = sanitize_post($pages[$i], 'raw'); |
| 4557 | } |
| 4558 | |
| Line | Code |
| 4592 | |
| 4593 | /** |
| 4594 | * Filter the retrieved list of pages. |
| 4595 | * |
| 4596 | * @since 2.1.0 |
| 4597 | * |
| 4598 | * @param array $pages List of pages to retrieve. |
| 4599 | * @param array $r Array of get_pages() arguments. |
| 4600 | */ |
| 4601 | return apply_filters( 'get_pages', $pages, $r ); |
| 4602 | } |
| 4603 | |
| 4604 | // |
| 4605 | // Attachment functions |
| 4606 | // |
| 4607 | |
| 4608 | /** |
| 4609 | * Check if the attachment URI is local one and is really an attachment. |
| 4610 | * |