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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 |
|---|---|
| 4688 | $new = implode( "\n", $pung ); |
| 4689 | |
| 4690 | /** |
| 4691 | * Filters the new ping URL to add for the given post. |
| 4692 | * |
| 4693 | * @since 2.0.0 |
| 4694 | * |
| 4695 | * @param string $new New ping URL to add. |
| 4696 | */ |
| 4697 | $new = apply_filters( 'add_ping', $new ); |
| 4698 | |
| 4699 | $return = $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post->ID ) ); |
| 4700 | clean_post_cache( $post->ID ); |
| 4701 | return $return; |
| 4702 | } |
| 4703 | |
| 4704 | /** |
| 4705 | * Retrieve enclosures already enclosed for a post. |
| 4706 | * |