php之简单socket编程

一、什么是套接字

源IP地址和目的IP地址以及源端口号和目的端口号的组合称为套接字。其用于标识客户端请求的服务器和服务。

二、php套接字实例

服务端代码：socket.php

<?php
error_reporting(E_ALL);
set_time_limit(0);
$chr_13_10 = "\r\n"; //回车 换行
//ob_implicit_flush();

$address = '127.0.0.1';
$port = 10005;
//创建 套接字
if( ($socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) {
    echo "socket_create() failed: ", socket_strerror(socket_last_error($socket)), $chr_13_10;
}

//将 套接字 绑定到端口
if (socket_bind($socket, $address, $port) === false) {
    echo "socket_bind() failed: ", socket_strerror(socket_last_error($socket)), $chr_13_10;
}

//允许其它 套接字 进行连接
if (socket_listen($socket, 5) === false) {
    echo "socket_bind() failed: ", socket_strerror(socket_last_error($socket)), $chr_13_10;
}

do {
    //等待连接
    if (($msgsocket = socket_accept($socket)) === false) {
        echo "socket_accepty() failed: ", socket_strerror(socket_last_error($socket)), $chr_13_10;
        break;
    }
    //读取客户端的信息
    echo 'client message: ',$chr_13_10;
    $buffer = socket_read($msgsocket, 8192);
    echo $buffer,$chr_13_10;
    //将读取到的信息，返回给客户端
    if (false === socket_write($msgsocket, $buffer, strlen($buffer))) {
        echo "socket_write() failed: ", socket_strerror(socket_last_error($msgsocket)), $chr_13_10;
    }
    //关闭本次连接
    socket_close($msgsocket);
} while(true);

//关闭 套接字
socket_close($socket);

客户端代码：client.php

<?php
$chr_13_10 = "\r\n"; //回车 换行
$service_port = 10005;
$address = '127.0.0.1';
//创建 套接字
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket === false) {
    echo "socket_create() failed: ", socket_strerror(socket_last_error($socket)), $chr_13_10;
} else {
    echo "socket create OK", $chr_13_10;
}
//连接到其它 套接字
$result = socket_connect($socket, $address, $service_port);
if($result === false) {
    echo "socket_connect() failed: ", socket_strerror(socket_last_error($socket)), $chr_13_10;
} else {
    echo "socket connect OK", $chr_13_10;
}

$in = "";
if(isset($argv[1])) $in .= $argv[1];
//向已连接的 套接字 写入信息
socket_write($socket, $in, strlen($in));
echo  "socket write OK", $chr_13_10;

echo "Reading response-------------------------->start", $chr_13_10;
$out = "";
//读取已连接的 套接字 发来的信息
while ($out = socket_read($socket, 8192)) {
    echo $out;
}
echo $chr_13_10, "Reading response-------------------------->end", $chr_13_10;

socket_close($socket);
echo "socket close OK",$chr_13_10;

三、代码演示结果

1、打开一个cmd去启动服务端

2、再打开一个cmd去启动客户端

3、查看服务端对应的cmd

四、《HTTP权威指南》中截取的两张图片

1、TCP客户端和服务器通过TCP套接字接口进行通信的流程

2、对TCP连接进行编程所需的常见套接字接口函数