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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 |
|---|---|
| 3343 | * |
| 3344 | * @param int $post_id Post ID |
| 3345 | * @return array |
| 3346 | */ |
| 3347 | function get_to_ping($post_id) { |
| 3348 | global $wpdb; |
| 3349 | $to_ping = $wpdb->get_var( $wpdb->prepare( "SELECT to_ping FROM $wpdb->posts WHERE ID = %d", $post_id )); |
| 3350 | $to_ping = sanitize_trackback_urls( $to_ping ); |
| 3351 | $to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY); |
| 3352 | $to_ping = apply_filters('get_to_ping', $to_ping); |
| 3353 | return $to_ping; |
| 3354 | } |
| 3355 | |
| 3356 | /** |
| 3357 | * Do trackbacks for a list of URLs. |
| 3358 | * |
| 3359 | * @since 1.0.0 |
| 3360 | * |
| 3361 | * @param string $tb_list Comma separated list of URLs |