PHP Manual . ... PHP 3 <= 3.0.18, PHP 4 >= 4.0.0) fsockopen -- Open Internet or Unix domain socket connection . int fsockopen ( [string udp://hostname, int port [, int errno [, string errstr [, float timeout]]]]) . ... For the Internet domain, it will open a TCP socket connection to hostname on port port . ... php $fp = fsockopen("udp://127.0.0.1", 13, $errno, $errstr); if (!$fp) { echo "ERROR: $errno - $errstr<br>\n"; } else { fwrite($fp,"\n"); echo fread($fp, 26); fclose($fp); } ?> ...