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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 |
---|---|
4451 | $last_changed = microtime(); |
4452 | wp_cache_set( 'last_changed', $last_changed, 'posts' ); |
4453 | } |
4454 |
|
4455 | $cache_key = "get_pages:$key:$last_changed"; |
4456 | if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) { |
4457 | // Convert to WP_Post instances. |
4458 | $pages = array_map( 'get_post', $cache ); |
4459 | /** This filter is documented in wp-includes/post.php */ |
4460 | $pages = apply_filters( 'get_pages', $pages, $r ); |
4461 | return $pages; |
4462 | } |
4463 |
|
4464 | $inclusions = ''; |
4465 | if ( ! empty( $r['include'] ) ) { |
4466 | $child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include |
4467 | $parent = -1; |
4468 | $exclude = ''; |
4469 | $meta_key = ''; |
Line | Code |
4593 |
|
4594 | if ( ! empty( $number ) ) { |
4595 | $query .= ' LIMIT ' . $offset . ',' . $number; |
4596 | } |
4597 |
|
4598 | $pages = $wpdb->get_results($query); |
4599 |
|
4600 | if ( empty($pages) ) { |
4601 | /** This filter is documented in wp-includes/post.php */ |
4602 | $pages = apply_filters( 'get_pages', array(), $r ); |
4603 | return $pages; |
4604 | } |
4605 |
|
4606 | // Sanitize before caching so it'll only get done once. |
4607 | $num_pages = count($pages); |
4608 | for ($i = 0; $i < $num_pages; $i++) { |
4609 | $pages[$i] = sanitize_post($pages[$i], 'raw'); |
4610 | } |
4611 |
|
Line | Code |
4645 |
|
4646 | /** |
4647 | * Filters the retrieved list of pages. |
4648 | * |
4649 | * @since 2.1.0 |
4650 | * |
4651 | * @param array $pages List of pages to retrieve. |
4652 | * @param array $r Array of get_pages() arguments. |
4653 | */ |
4654 | return apply_filters( 'get_pages', $pages, $r ); |
4655 | } |
4656 |
|
4657 | // |
4658 | // Attachment functions |
4659 | // |
4660 |
|
4661 | /** |
4662 | * Check if the attachment URI is local one and is really an attachment. |
4663 | * |