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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 |
|---|---|
| 863 | $pung = apply_filters('get_pung', $pung); |
| 864 | return $pung; |
| 865 | } |
| 866 | |
| 867 | function get_to_ping($post_id) { // Get any URLs in the todo list |
| 868 | global $wpdb; |
| 869 | $to_ping = $wpdb->get_var("SELECT to_ping FROM $wpdb->posts WHERE ID = $post_id"); |
| 870 | $to_ping = trim($to_ping); |
| 871 | $to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY); |
| 872 | $to_ping = apply_filters('get_to_ping', $to_ping); |
| 873 | return $to_ping; |
| 874 | } |
| 875 | |
| 876 | // do trackbacks for a list of urls |
| 877 | // accepts a comma-separated list of trackback urls and a post id |
| 878 | function trackback_url_list($tb_list, $post_id) { |
| 879 | if (!empty($tb_list)) { |
| 880 | // get post data |
| 881 | $postdata = wp_get_single_post($post_id, ARRAY_A); |