http协议（2）

学习资源：燕十八的http课程（公开形式的资源，请自行查找） 二三节

我的笔记：

面向对象

新建一个http请求类,实现自定义接口Proto

在http类中重新实现方法

主要是通过fsockopen打开socket，然后从socket中读取网页资源，写入字符串中，再echo出来，具体的响应体可以通过查看源代码来获知

<?php
//http请求类接口
interface Proto{
//连接url
function conn($url);
//发送GET请求
function get();
//发送POST请求
function post();
//关闭连接
function close();
}

class Http implements Proto{
const CRLF = "\r\n";//carriage return line feed
protected $url = array();
protected $line = array();
protected $header = array();
protected $body = array();
protected $fh = null;
protected $version = 'HTTP/1.1';
protected $errno = -1;
protected $errstr = '';
protected $response = '';
public function __construct($url)
{
$this->conn($url);
$this->setHeader("Host:".$this->url["host"]);
}
//此方法负责写请求行
protected function setLine($method){
$this->line[] = $method." ".$this->url['path']." ".$this->version;
}
//此方法负责写请求头
protected function setHeader($headerLine){
$this->header[] = $headerLine;
}
//此方法负责写主体信息
protected function setBody(){

}
//连接url
public function conn($url){
$this->url = parse_url($url);
//判断端口
if(!isset($this->url['port'])){
$this->url['port'] = 80;
}
$this->fh = fsockopen($this->url['host'],$this->url['port'],$this->errno,$this->errstr,3);
}
//构造GET请求
public function get(){
$this->setLine("GET");
$this->request();
return $this->response;
}
//构造POST请求
public function post(){
}
//真正请求
public function request(){
//把请求行和body信息放在一个数组中，便于拼接
$req = array_merge($this->line,$this->header,array(''),$this->body,array(''));

$req = implode(self::CRLF, $req);
//print_r($req);
fwrite($this->fh,$req);
while(!feof($this->fh)){
$this->response.=fread($this->fh,1024);
}
$this->close();//关闭连接
}
//关闭连接
public function close(){

}
}

$url = "http://news.163.com/16/0317/20/BICRPR0400014PRF.html";
$http = new http($url);
echo $http->get();
//print_r($http);
//$http->request();