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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 |
|---|---|
| 630 | && !is_local_attachment($link_test) ) : // Also, let's never ping local attachments. |
| 631 | $test = parse_url($link_test); |
| 632 | if (isset($test['query'])) |
| 633 | $post_links[] = $link_test; |
| 634 | elseif(($test['path'] != '/') && ($test['path'] != '')) |
| 635 | $post_links[] = $link_test; |
| 636 | endif; |
| 637 | endforeach; |
| 638 | |
| 639 | do_action('pre_ping', array(&$post_links, &$pung)); |
| 640 | |
| 641 | foreach ($post_links as $pagelinkedto){ |
| 642 | debug_fwrite($log, "Processing -- $pagelinkedto\n"); |
| 643 | $pingback_server_url = discover_pingback_server_uri($pagelinkedto, 2048); |
| 644 | |
| 645 | if ($pingback_server_url) { |
| 646 | @ set_time_limit( 60 ); |
| 647 | // Now, the RPC call |
| 648 | debug_fwrite($log, "Page Linked To: $pagelinkedto \n"); |