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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.
| Line | Code |
|---|---|
| 759 | } |
| 760 | |
| 761 | function add_ping($post_id, $uri) { // Add a URI to those already pung |
| 762 | global $wpdb; |
| 763 | $pung = $wpdb->get_var("SELECT pinged FROM $wpdb->posts WHERE ID = $post_id"); |
| 764 | $pung = trim($pung); |
| 765 | $pung = preg_split('/\s/', $pung); |
| 766 | $pung[] = $uri; |
| 767 | $new = implode("\n", $pung); |
| 768 | $new = apply_filters('add_ping', $new); |
| 769 | return $wpdb->query("UPDATE $wpdb->posts SET pinged = '$new' WHERE ID = $post_id"); |
| 770 | } |
| 771 | |
| 772 | //fetches the pages returned as a FLAT list, but arranged in order of their hierarchy, i.e., child parents |
| 773 | //immediately follow their parents |
| 774 | function get_page_hierarchy($posts, $parent = 0) { |
| 775 | $result = array ( ); |
| 776 | if ($posts) { foreach ($posts as $post) { |
| 777 | if ($post->post_parent == $parent) { |