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pingback [ ]

pingback ( $content, $post_ID )
Parameters:
  • (string) $content Post content to check for links.
  • (int) $post_ID Post ID.
Uses:
  • $wp_version
  • IXR_Client
Defined at:
Codex



Pings back the links found in a post.

Source 

function pingback($content, $post_ID) {
	global $wp_version;
	include_once(ABSPATH . WPINC . '/class-IXR.php');
	include_once(ABSPATH . WPINC . '/class-wp-http-ixr-client.php');

	// original code by Mort (http://mort.mine.nu:8080)
	$post_links = array();

	$pung = get_pung($post_ID);

	// Variables
	$ltrs = '\w';
	$gunk = '/#~:.?+=&%@!\-';
	$punc = '.:?\-';
	$any = $ltrs . $gunk . $punc;

	// Step 1
	// Parsing the post, external links (if any) are stored in the $post_links array
	// This regexp comes straight from phpfreaks.com
	// http://www.phpfreaks.com/quickcode/Extract_All_URLs_on_a_Page/15.php
	preg_match_all("{\b http : [$any] +? (?= [$punc] * [^$any] | $)}x", $content, $post_links_temp);

	// Step 2.
	// Walking thru the links array
	// first we get rid of links pointing to sites, not to specific files
	// Example:
	// http://dummy-weblog.org
	// http://dummy-weblog.org/
	// http://dummy-weblog.org/post.php
	// We don't wanna ping first and second types, even if they have a valid <link/>

	foreach ( (array) $post_links_temp[0] as $link_test ) :
		if ( !in_array($link_test, $pung) && (url_to_postid($link_test) != $post_ID) // If we haven't pung it already and it isn't a link to itself
				&& !is_local_attachment($link_test) ) : // Also, let's never ping local attachments.
			if ( $test = @parse_url($link_test) ) {
				if ( isset($test['query']) )
					$post_links[] = $link_test;
				elseif ( isset( $test['path'] ) && ( $test['path'] != '/' ) && ( $test['path'] != '' ) )
					$post_links[] = $link_test;
			}
		endif;
	endforeach;

	$post_links = array_unique( $post_links );
	do_action_ref_array( 'pre_ping', array( &$post_links, &$pung, $post_ID ) );

	foreach ( (array) $post_links as $pagelinkedto ) {
		$pingback_server_url = discover_pingback_server_uri( $pagelinkedto );

		if ( $pingback_server_url ) {
			@ set_time_limit( 60 );
			 // Now, the RPC call
			$pagelinkedfrom = get_permalink($post_ID);

			// using a timeout of 3 seconds should be enough to cover slow servers
			$client = new WP_HTTP_IXR_Client($pingback_server_url);
			$client->timeout = 3;
			$client->useragent = apply_filters( 'pingback_useragent', $client->useragent . ' -- WordPress/' . $wp_version, $client->useragent, $pingback_server_url, $pagelinkedto, $pagelinkedfrom);
			// when set to true, this outputs debug messages by itself
			$client->debug = false;

			if ( $client->query('pingback.ping', $pagelinkedfrom, $pagelinkedto) || ( isset($client->error->code) && 48 == $client->error->code ) ) // Already registered
				add_ping( $post_ID, $pagelinkedto );
		}
	}
}

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