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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 |
|---|---|
| 1985 | * |
| 1986 | * @param int $post_id Post ID |
| 1987 | * @return array |
| 1988 | */ |
| 1989 | function get_to_ping($post_id) { |
| 1990 | global $wpdb; |
| 1991 | $to_ping = $wpdb->get_var( $wpdb->prepare( "SELECT to_ping FROM $wpdb->posts WHERE ID = %d", $post_id )); |
| 1992 | $to_ping = trim($to_ping); |
| 1993 | $to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY); |
| 1994 | $to_ping = apply_filters('get_to_ping', $to_ping); |
| 1995 | return $to_ping; |
| 1996 | } |
| 1997 | |
| 1998 | /** |
| 1999 | * Do trackbacks for a list of URLs. |
| 2000 | * |
| 2001 | * @since 1.0.0 |
| 2002 | * |
| 2003 | * @param string $tb_list Comma separated list of URLs |