PHP socket通信之UDP

//服务器信息
$server = 'udp://127.0.0.1:9998';
//消息结束符号
$msg_eof = "\n";
$socket = stream_socket_server($server, $errno, $errstr, STREAM_SERVER_BIND);
if (!$socket) {
die("$errstr ($errno)");
}

do {
//接收客户端发来的信息
$inMsg = stream_socket_recvfrom($socket, 1024, 0, $peer);
//服务端打印出相关信息
echo "Client : $peer\n";
echo "Receive : {$inMsg}";
//给客户端发送信息
$outMsg = substr($inMsg, 0, (strrpos($inMsg, $msg_eof))).' -- '.date("D M j H:i:s Y\r\n");
stream_socket_sendto($socket, $outMsg, 0, $peer);

} while ($inMsg !== false);

function udpGet($sendMsg = '', $ip = '127.0.0.1', $port = '9998'){
$handle = stream_socket_client("udp://{$ip}:{$port}", $errno, $errstr);
if( !$handle ){
die("ERROR: {$errno} - {$errstr}\n");
}
fwrite($handle, $sendMsg."\n");
$result = fread($handle, 1024);
fclose($handle);
return $result;
}

$result = udpGet('Hello World');
echo $result;