Example analysis of how to implement simulated http requests in PHP

In the brief analysis of http, we mentioned a process of browser requesting resources, so can this process be simulated with PHP? The answer is yes. This article mainly introduces the method of simulating http requests in PHP. It briefly analyzes the principles and processes of http requests and the related operating techniques of simulating http requests in PHP. Friends who need it can refer to it. I hope it can help everyone.

php needs to implement the following steps to simulate http requests:

1. Connect to the apache server

Use fsockopen: specifically used to connect to the server and get a connection resource

2. Write http protocol

Use fwrite to write content to the resource

3.Receive data

The data returned after the request is successful will be stored in the resource

4. Parse data:

Use fgets and fgetc function

Implementation code:

<?php
  //php模拟发出http请求
  //1.连接目标服务器apache
  $f=fsockopen(&#39;localhost&#39;,98,$erron,$error);
  //2.写入http协议
  //2.1拼凑http协议
  //请求行
  $http="GET /phpstudy/index.php HTTP/1.1\r\n";
  //请求头
  $http .="Host:localhost\r\n";
  //空行
  $http .="\r\n";
  //2.2写给apache服务器
  if(fwrite($f,$http))
  {
    //写入成功
    //3.数据已经接收并存放在f资源中
    //4.解析资源
    //循环遍历
    while($line=fgets($f,1024))
    {
      //输出
      echo $line ."</br>";
    }
  }

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