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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 |
|---|---|
| 2788 | /** |
| 2789 | * Fires just before pinging back links found in a post. |
| 2790 | * |
| 2791 | * @since 2.0.0 |
| 2792 | * |
| 2793 | * @param string[] $post_links Array of link URLs to be checked (passed by reference). |
| 2794 | * @param string[] $pung Array of link URLs already pinged (passed by reference). |
| 2795 | * @param int $post_ID The post ID. |
| 2796 | */ |
| 2797 | do_action_ref_array( 'pre_ping', array( &$post_links, &$pung, $post->ID ) ); |
| 2798 | |
| 2799 | foreach ( (array) $post_links as $pagelinkedto ) { |
| 2800 | $pingback_server_url = discover_pingback_server_uri( $pagelinkedto ); |
| 2801 | |
| 2802 | if ( $pingback_server_url ) { |
| 2803 | @ set_time_limit( 60 ); |
| 2804 | // Now, the RPC call |
| 2805 | $pagelinkedfrom = get_permalink( $post ); |
| 2806 | |