PHP基于socket实现客户端和服务端通讯功能

<?php
 set_time_limit(0);
 $host="localhost";
 $port=1001;
 //创建一个连接
 $socket=socket_create(AF_INET,SOCK_STREAM,SOL_TCP)or die("cannot create socket\n");
 //绑定socket到端口
 $result=socket_bind($socket,$host,$port) or die("cannot bind port to socket\n");
 //开始监听这个端口
 $result=socket_listen($socket,4) or die("could not set up socket listen\n");
 //接受连接，另一个socket来处理通信
 $msgsock=socket_accept($socket) or die("cannot accept incoming connection\n");
 if($msgsock){
  echo date("Y-m-d H:i:s D a");
 }
 //读取客户端发送过来的信息
 $input=socket_read($msgsock,1024) or die("cannot read input\n");
 $input=trim($input);
 $output=strrev($input)."顺序反过来了吧\n";
 //对接收到的信息进行处理，然后返回到客户端
 socket_write($msgsock,$output,strlen($output)) or die("cannot write");
 //关闭socket连接
 socket_close($msgsock);
 socket_close($socket);
?>

<?php
 set_time_limit(0);
 $host="localhost";
 $port=1001;
 //创建一个socket
 $socket=socket_create(AF_INET,SOCK_STREAM,SOL_TCP)or die("cannot create socket\n");
 $conn=socket_connect($socket,$host,$port) or die("cannot connect server\n");
 if($conn){echo "client connect ok!";}
 socket_write($socket,"hello world!") or die("cannot write data\n");
 $buffer=socket_read($socket,1024,PHP_NORMAL_READ);
 if($buffer){
  echo "response was:".$buffer."\n";
 }
 socket_close($socket);
?>