PHP的Socket通信之UDP通信实例

//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 : $peern"; 
  echo "receive : {$inmsg}"; 
  //给客户端发送信息 
  $outmsg = substr($inmsg, 0, (strrpos($inmsg, $msg_eof))).' -- '.date("d m j h:i:s yrn"); 
  stream_socket_sendto($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;