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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 |
|---|---|
| 1790 | if ( $test = @parse_url($link_test) ) { |
| 1791 | if ( isset($test['query']) ) |
| 1792 | $post_links[] = $link_test; |
| 1793 | elseif ( isset( $test['path'] ) && ( $test['path'] != '/' ) && ( $test['path'] != '' ) ) |
| 1794 | $post_links[] = $link_test; |
| 1795 | } |
| 1796 | endif; |
| 1797 | endforeach; |
| 1798 | |
| 1799 | do_action_ref_array('pre_ping', array(&$post_links, &$pung)); |
| 1800 | |
| 1801 | foreach ( (array) $post_links as $pagelinkedto ) { |
| 1802 | $pingback_server_url = discover_pingback_server_uri( $pagelinkedto ); |
| 1803 | |
| 1804 | if ( $pingback_server_url ) { |
| 1805 | @ set_time_limit( 60 ); |
| 1806 | // Now, the RPC call |
| 1807 | $pagelinkedfrom = get_permalink($post_ID); |
| 1808 | |