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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 |
---|---|
3317 | * |
3318 | * @param int $post_id Post ID |
3319 | * @return array |
3320 | */ |
3321 | function get_to_ping($post_id) { |
3322 | global $wpdb; |
3323 | $to_ping = $wpdb->get_var( $wpdb->prepare( "SELECT to_ping FROM $wpdb->posts WHERE ID = %d", $post_id )); |
3324 | $to_ping = sanitize_trackback_urls( $to_ping ); |
3325 | $to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY); |
3326 | $to_ping = apply_filters('get_to_ping', $to_ping); |
3327 | return $to_ping; |
3328 | } |
3329 |
|
3330 | /** |
3331 | * Do trackbacks for a list of URLs. |
3332 | * |
3333 | * @since 1.0.0 |
3334 | * |
3335 | * @param string $tb_list Comma separated list of URLs |