Analysis and explanation of the method of simulating http requests in PHP

This article mainly introduces the method of simulating http requests in PHP. It briefly analyzes the principle and process of http requests and the related operating skills of php to simulate http requests. Friends in need can refer to this article

The example describes how to simulate http requests in PHP. Share it with everyone for your reference, the details are as follows:

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.

php simulates http requests and needs to implement the following steps:

1. Connect to the apache server

Use fsockopen: specifically for Connect to the server and get a connection resource

2. Write the 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 the 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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