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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 |
|---|---|
| 5285 | $key = md5( serialize( wp_array_slice_assoc( $parsed_args, array_keys( $defaults ) ) ) ); |
| 5286 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
| 5287 | |
| 5288 | $cache_key = "get_pages:$key:$last_changed"; |
| 5289 | $cache = wp_cache_get( $cache_key, 'posts' ); |
| 5290 | if ( false !== $cache ) { |
| 5291 | // Convert to WP_Post instances. |
| 5292 | $pages = array_map( 'get_post', $cache ); |
| 5293 | /** This filter is documented in wp-includes/post.php */ |
| 5294 | $pages = apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5295 | return $pages; |
| 5296 | } |
| 5297 | |
| 5298 | $inclusions = ''; |
| 5299 | if ( ! empty( $parsed_args['include'] ) ) { |
| 5300 | $child_of = 0; // Ignore child_of, parent, exclude, meta_key, and meta_value params if using include. |
| 5301 | $parent = -1; |
| 5302 | $exclude = ''; |
| 5303 | $meta_key = ''; |
| Line | Code |
| 5445 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 5446 | } |
| 5447 | |
| 5448 | $pages = $wpdb->get_results( $query ); |
| 5449 | |
| 5450 | if ( empty( $pages ) ) { |
| 5451 | wp_cache_set( $cache_key, array(), 'posts' ); |
| 5452 | |
| 5453 | /** This filter is documented in wp-includes/post.php */ |
| 5454 | $pages = apply_filters( 'get_pages', array(), $parsed_args ); |
| 5455 | return $pages; |
| 5456 | } |
| 5457 | |
| 5458 | // Sanitize before caching so it'll only get done once. |
| 5459 | $num_pages = count( $pages ); |
| 5460 | for ( $i = 0; $i < $num_pages; $i++ ) { |
| 5461 | $pages[ $i ] = sanitize_post( $pages[ $i ], 'raw' ); |
| 5462 | } |
| 5463 | |
| Line | Code |
| 5497 | |
| 5498 | /** |
| 5499 | * Filters the retrieved list of pages. |
| 5500 | * |
| 5501 | * @since 2.1.0 |
| 5502 | * |
| 5503 | * @param WP_Post[] $pages Array of page objects. |
| 5504 | * @param array $parsed_args Array of get_pages() arguments. |
| 5505 | */ |
| 5506 | return apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5507 | } |
| 5508 | |
| 5509 | // |
| 5510 | // Attachment functions. |
| 5511 | // |
| 5512 | |
| 5513 | /** |
| 5514 | * Determines whether an attachment URI is local and really an attachment. |
| 5515 | * |