<?php

//http连接接口

interface proto{

    //连接url

    public function conn($url);

    //发送get请求

    public function get();

    //发送post

    public function post($num);

    //关闭连接

    public function close();

}

class Http implements proto{

    const CRLF="\r\n";

    protected $response='';

    protected $poststr='';

    protected $errno=-1;

    protected $errstr='';

    protected $version='HTTP/1.1';

    protected $fh=null;

    protected $url=array();

    protected $line=array();

    protected $header=array();

    protected $body=array();

    public function __construct($url){

        $this->conn($url);

        $this->setheader();

    }

    //负责写请求行

    protected function setLine($method){

        $this->line[0]=$method .' '.$this->url['path'] .' '.$this->version;

    }

    //负责写请求信息

    protected function setHeader(){

        $this->header[]='Host:'.$this->url['host'];

    }

    //负责写主题信息

    protected function setBody($body){

        $this->body=array(http_build_query($body));

    }

    //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请求数据

    public function get(){

        $this->setLine('GET');

        $this->request();

        return $this->response;

    }

    //构造post请求数据

    public function post($body=array()){

        $this->setLine('POST');

        $this->header[]='content-type:application/x-www-form-urlencoded';

        // print_r($this->header);

        $this->setBody($body);

        $this->header[]='content-length:'.strlen($this->body[0]);

        $this->request();

        return $this->response;

    }

    //真正的请求

    public function request(){

        $req=array_merge($this->line,$this->header,array(''),$this->body,array(''));//拼接请求信息为数组

        // print_r($req);

        $req=implode(self::CRLF,$req);

        //echo $req;exit();

        fwrite($this->fh,$req);

        while(!feof($this->fh)){

            $this->response.=fread($this->fh,1024);

        }

        $this->close();

    }

    //关闭连接

    public function close(){

        fclose($this->fh);

    }

}

//调试

$url='http://localhost/tieba/cunchu.php';

$http=new Http($url);

// echo $http->get();

// print_r($http);

echo $http->post(array('username'=>'zhangsan','title'=>'试试发帖','content'=>'这是用http协议拼接数据发送的'));

?>