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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 |
|---|---|
| 5443 | $key = md5( serialize( wp_array_slice_assoc( $parsed_args, array_keys( $defaults ) ) ) ); |
| 5444 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
| 5445 | |
| 5446 | $cache_key = "get_pages:$key:$last_changed"; |
| 5447 | $cache = wp_cache_get( $cache_key, 'posts' ); |
| 5448 | if ( false !== $cache ) { |
| 5449 | // Convert to WP_Post instances. |
| 5450 | $pages = array_map( 'get_post', $cache ); |
| 5451 | /** This filter is documented in wp-includes/post.php */ |
| 5452 | $pages = apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5453 | return $pages; |
| 5454 | } |
| 5455 | |
| 5456 | $inclusions = ''; |
| 5457 | if ( ! empty( $parsed_args['include'] ) ) { |
| 5458 | $child_of = 0; // Ignore child_of, parent, exclude, meta_key, and meta_value params if using include. |
| 5459 | $parent = -1; |
| 5460 | $exclude = ''; |
| 5461 | $meta_key = ''; |
| Line | Code |
| 5603 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 5604 | } |
| 5605 | |
| 5606 | $pages = $wpdb->get_results( $query ); |
| 5607 | |
| 5608 | if ( empty( $pages ) ) { |
| 5609 | wp_cache_set( $cache_key, array(), 'posts' ); |
| 5610 | |
| 5611 | /** This filter is documented in wp-includes/post.php */ |
| 5612 | $pages = apply_filters( 'get_pages', array(), $parsed_args ); |
| 5613 | return $pages; |
| 5614 | } |
| 5615 | |
| 5616 | // Sanitize before caching so it'll only get done once. |
| 5617 | $num_pages = count( $pages ); |
| 5618 | for ( $i = 0; $i < $num_pages; $i++ ) { |
| 5619 | $pages[ $i ] = sanitize_post( $pages[ $i ], 'raw' ); |
| 5620 | } |
| 5621 | |
| Line | Code |
| 5655 | |
| 5656 | /** |
| 5657 | * Filters the retrieved list of pages. |
| 5658 | * |
| 5659 | * @since 2.1.0 |
| 5660 | * |
| 5661 | * @param WP_Post[] $pages Array of page objects. |
| 5662 | * @param array $parsed_args Array of get_pages() arguments. |
| 5663 | */ |
| 5664 | return apply_filters( 'get_pages', $pages, $parsed_args ); |
| 5665 | } |
| 5666 | |
| 5667 | // |
| 5668 | // Attachment functions. |
| 5669 | // |
| 5670 | |
| 5671 | /** |
| 5672 | * Determines whether an attachment URI is local and really an attachment. |
| 5673 | * |