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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 |
|---|---|
| 1840 | if ( isset($test['query']) ) |
| 1841 | $post_links[] = $link_test; |
| 1842 | elseif ( isset( $test['path'] ) && ( $test['path'] != '/' ) && ( $test['path'] != '' ) ) |
| 1843 | $post_links[] = $link_test; |
| 1844 | } |
| 1845 | endif; |
| 1846 | endforeach; |
| 1847 | |
| 1848 | $post_links = array_unique( $post_links ); |
| 1849 | do_action_ref_array( 'pre_ping', array( &$post_links, &$pung, $post_ID ) ); |
| 1850 | |
| 1851 | foreach ( (array) $post_links as $pagelinkedto ) { |
| 1852 | $pingback_server_url = discover_pingback_server_uri( $pagelinkedto ); |
| 1853 | |
| 1854 | if ( $pingback_server_url ) { |
| 1855 | @ set_time_limit( 60 ); |
| 1856 | // Now, the RPC call |
| 1857 | $pagelinkedfrom = get_permalink($post_ID); |
| 1858 | |