Use socket series functions to connect to TCP services

First of all, we need to have a tcp service. We use the socket series functions in php to implement

<?php

//创建socket套接字
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
//设置阻塞模式
socket_set_block($socket);
//为套接字绑定ip和端口
socket_bind($socket,&#39;127.0.0.1&#39;,3046);
//监听socket
socket_listen($socket,4);

while(true)
{
    //接收客户端请求
    if(($msgsocket = socket_accept($socket)) !== false)
    {
        //读取请求内容
        $buf = socket_read($msgsocket, 8192);
        echo "Received msg: $buf \n";
        $str = "this is a service message";
        //向连接的客户端发送数据 
        socket_write($msgsocket, $str,strlen($str));
        //操作完之后需要关闭该连接否则 feof() 函数无法正确识别打开的句柄是否读取完成
        socket_close($msgsocket);
    }
}

Connect to the tcp service:

Use socket series functions to connect

<?php
$st="socket send message";
$length = strlen($st);
//创建tcp套接字
$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
//连接tcp
socket_connect($socket, &#39;127.0.0.1&#39;,3046);
//向打开的套集字写入数据（发送数据）
$s = socket_write($socket, $st, $length);
//从套接字中获取服务器发送来的数据
$msg = socket_read($socket,8190);

echo $msg;
//关闭连接
socket_close($socket);

Use fsockopen to connect

<?php
//使用 fsockopen 打开tcp连接句柄
$fp = fsockopen("tcp://127.0.0.1",3046);
$msg = "fsockopen send message";
//向句柄中写入数据
fwrite($fp,$msg);
$ret = "";
//循环遍历获取句柄中的数据，其中 feof() 判断文件指针是否指到文件末尾
while (!feof($fp)){
    stream_set_timeout($fp, 2);
    $ret .= fgets($fp, 128);
}
//关闭句柄
fclose($fp);
echo $ret;

Use stream_socket_client Connection

<?php
//使用 stream_socket_client 打开 tcp 连接
$fp = stream_socket_client("tcp://127.0.0.1:3046");
$msg = "fsockopen send message";
//向句柄中写入数据
fwrite($fp,$msg);
$ret = "";
//循环遍历获取句柄中的数据，其中 feof() 判断文件指针是否指到文件末尾
while (!feof($fp)){
    stream_set_timeout($fp, 2);
    $ret .= fgets($fp, 128);
}
//关闭句柄
fclose($fp);
echo $ret;

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