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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 |
|---|---|
| 882 | // |
| 883 | |
| 884 | function add_ping($post_id, $uri) { // Add a URL to those already pung |
| 885 | global $wpdb; |
| 886 | $pung = $wpdb->get_var("SELECT pinged FROM $wpdb->posts WHERE ID = $post_id"); |
| 887 | $pung = trim($pung); |
| 888 | $pung = preg_split('/\s/', $pung); |
| 889 | $pung[] = $uri; |
| 890 | $new = implode("\n", $pung); |
| 891 | $new = apply_filters('add_ping', $new); |
| 892 | return $wpdb->query("UPDATE $wpdb->posts SET pinged = '$new' WHERE ID = $post_id"); |
| 893 | } |
| 894 | |
| 895 | function get_enclosed($post_id) { // Get enclosures already enclosed for a post |
| 896 | global $wpdb; |
| 897 | $custom_fields = get_post_custom( $post_id ); |
| 898 | $pung = array(); |
| 899 | if ( !is_array( $custom_fields ) ) |
| 900 | return $pung; |