akismet_get_host

Source code

function akismet_get_host($host) {

	// if all servers are accessible, just return the host name.

	// if not, return an IP that was known to be accessible at the last check.

	if ( akismet_server_connectivity_ok() ) {

		return $host;

	} else {

		$ips = akismet_get_server_connectivity();

		// a firewall may be blocking access to some Akismet IPs

		if ( count($ips) > 0 && count(array_filter($ips)) < count($ips) ) {

			// use DNS to get current IPs, but exclude any known to be unreachable

			$dns = (array)gethostbynamel( rtrim($host, '.') . '.' );

			$dns = array_filter($dns);

			foreach ( $dns as $ip ) {

				if ( array_key_exists( $ip, $ips ) && empty( $ips[$ip] ) )

					unset($dns[$ip]);

			}

			// return a random IP from those available

			if ( count($dns) )

				return $dns[ array_rand($dns) ];

			

		}

	}

	// if all else fails try the host name

	return $host;

}