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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 |
|---|---|
| 3400 | * |
| 3401 | * @param int $post_id Post ID |
| 3402 | * @return array |
| 3403 | */ |
| 3404 | function get_to_ping($post_id) { |
| 3405 | global $wpdb; |
| 3406 | $to_ping = $wpdb->get_var( $wpdb->prepare( "SELECT to_ping FROM $wpdb->posts WHERE ID = %d", $post_id )); |
| 3407 | $to_ping = sanitize_trackback_urls( $to_ping ); |
| 3408 | $to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY); |
| 3409 | $to_ping = apply_filters('get_to_ping', $to_ping); |
| 3410 | return $to_ping; |
| 3411 | } |
| 3412 | |
| 3413 | /** |
| 3414 | * Do trackbacks for a list of URLs. |
| 3415 | * |
| 3416 | * @since 1.0.0 |
| 3417 | * |
| 3418 | * @param string $tb_list Comma separated list of URLs |