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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 |
|---|---|
| 722 | && !is_local_attachment($link_test) ) : // Also, let's never ping local attachments. |
| 723 | $test = parse_url($link_test); |
| 724 | if ( isset($test['query']) ) |
| 725 | $post_links[] = $link_test; |
| 726 | elseif ( ($test['path'] != '/') && ($test['path'] != '') ) |
| 727 | $post_links[] = $link_test; |
| 728 | endif; |
| 729 | endforeach; |
| 730 | |
| 731 | do_action_ref_array('pre_ping', array(&$post_links, &$pung)); |
| 732 | |
| 733 | foreach ( (array) $post_links as $pagelinkedto ) { |
| 734 | $pingback_server_url = discover_pingback_server_uri($pagelinkedto, 2048); |
| 735 | |
| 736 | if ( $pingback_server_url ) { |
| 737 | @ set_time_limit( 60 ); |
| 738 | // Now, the RPC call |
| 739 | $pagelinkedfrom = get_permalink($post_ID); |
| 740 | |