最近好奇，接触接触PHP的socket编程，发现还是很好玩儿的。下面贴出来demo源码跟大家分享

Server.php

<?php

/**
 *  PHP Socket Server
 * */
//确保客户端连接时不会超时
error_reporting(0);                                                                                                                          
set_time_limit(0);
//设置地址与端口
$address = '127.0.0.1'; //服务端ip
$port = 2046;
//创建socket：AF_INET=是ipv4 如果用ipv6，则参数为 AF_INET6 ， SOCK_STREAM为socket的tcp类型，如果是UDP则使用SOCK_DGRAM
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() failed : ".socket_strerror(socket_last_error()). "\n");
//阻塞模式
socket_set_block($sock) or die("socket_set_block() failed : ".socket_strerror(socket_last_error()) ."\n");

//绑定到socket端口
$result = socket_bind($sock, $address, $port) or die("socket_bind() failed : ". socket_strerror(socket_last_error()) . "\n");
//开始监听
$result = socket_listen($sock, 4) or die("socket_listen() failed : ". socket_strerror(socket_last_error()) . "\n");
echo "OK\nBinding the socket on $address:$port ...\n";
echo "OK\nNow ready to accept connections.\nListening on the socket ...\n";

do {//Never stop the daemon
    //它接收连接请求并调用一个子链接socket来处理客户端和服务器间的信息
    $msgsock = socket_accept($sock) or die("sock_accept() failed : ". socket_strerror(socket_last_error()) . "\n");

    //读取客户端数据
    echo "Read client data \n";
    $buf = socket_read($msgsock, 8192);
    echo "Received msg : $buf  \n";

    //数据传输，向客户端写入返回结果
    $msg = "welcome \n";
    socket_write($msgsock, $msg, strlen($msg)) or die("socket_write() failed : ". socket_strerror(socket_last_error()). "\n");
    //输出返回到客户端时，父/子socket都应通过socket_close来终止
    socket_close($msgsock);
}while(true);

socket_close($sock);

Client.php

<?php
/**
 *  php socket client
 * */

error_reporting(0);                                                                                                                          
set_time_limit(0);

$host = '127.0.0.1';
$port = 2046;

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("Could not create socket.\n");

$connection = socket_connect($socket, $host, $port) or die("Could not connect server.\n");
socket_write($socket, "Hello Socket!") or die("Write failed.\n");
while($buff = socket_read($socket, 1024, PHP_NORMAL_READ)) {
    echo "Response was : ". $buff . "\n";
}

socket_close($socket);