socket和pack的有关问题

$message = '';

$message .= pack("a99", $mail);

$message .= pack("a32", $pass);

$message .= pack("a19", $action);

$from = '';

$port = 0;

//echo $message;



if ($socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP))

{

	//socket_bind($socket, '127.0.0.1', 27015);

	socket_sendto($socket, $message, strlen($message), 0, $server_ip, $server_port);

	$ret = socket_recvfrom($socket, $result, 12, MSG_WAITALL, $from, $port);

}