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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 |
|---|---|
| 5246 | $key = md5( serialize( wp_array_slice_assoc( $parsed_args, array_keys( $defaults ) ) ) ); |
| 5247 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
| 5248 | |
| 5249 | $cache_key = "get_pages:$key:$last_changed"; |
| 5250 | $cache = wp_cache_get( $cache_key, 'posts' ); |
| 5251 | if ( false !== $cache ) { |
| 5252 | // Convert to WP_Post instances. |
| 5253 | $pages = array_map( 'get_post', $cache ); |
| 5254 | /** This filter is documented in wp-includes/post.php */ |
| 5255 | $pages = apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5256 | return $pages; |
| 5257 | } |
| 5258 | |
| 5259 | $inclusions = ''; |
| 5260 | if ( ! empty( $parsed_args['include'] ) ) { |
| 5261 | $child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include |
| 5262 | $parent = -1; |
| 5263 | $exclude = ''; |
| 5264 | $meta_key = ''; |
| Line | Code |
| 5406 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 5407 | } |
| 5408 | |
| 5409 | $pages = $wpdb->get_results( $query ); |
| 5410 | |
| 5411 | if ( empty( $pages ) ) { |
| 5412 | wp_cache_set( $cache_key, array(), 'posts' ); |
| 5413 | |
| 5414 | /** This filter is documented in wp-includes/post.php */ |
| 5415 | $pages = apply_filters( 'get_pages', array(), $parsed_args ); |
| 5416 | return $pages; |
| 5417 | } |
| 5418 | |
| 5419 | // Sanitize before caching so it'll only get done once. |
| 5420 | $num_pages = count( $pages ); |
| 5421 | for ( $i = 0; $i < $num_pages; $i++ ) { |
| 5422 | $pages[ $i ] = sanitize_post( $pages[ $i ], 'raw' ); |
| 5423 | } |
| 5424 | |
| Line | Code |
| 5458 | |
| 5459 | /** |
| 5460 | * Filters the retrieved list of pages. |
| 5461 | * |
| 5462 | * @since 2.1.0 |
| 5463 | * |
| 5464 | * @param array $pages List of pages to retrieve. |
| 5465 | * @param array $parsed_args Array of get_pages() arguments. |
| 5466 | */ |
| 5467 | return apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5468 | } |
| 5469 | |
| 5470 | // |
| 5471 | // Attachment functions |
| 5472 | // |
| 5473 | |
| 5474 | /** |
| 5475 | * Determines whether an attachment URI is local and really an attachment. |
| 5476 | * |