php实现模拟get和post请求的代码

<?php
    error_reporting(0);
    $user_agent="Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.10)";

    list($rheaders,$conntent)=request_url("60.28.14.148","80","get","http://mat1.gtimg.com/www/iskin960/qqcomlogo.png",array("User-Agent"=> $user_agent),array());

    //list($rheaders,$conntent)=request_url("","","get","http://www.baidu.com/s",array("User-Agent"=>$user_agent),array("wd"=>"test"));
    if($rheaders["httpstatus"]>=200&&$rheaders["httpstatus"]<=300)
    {
      //根据返回的类型，修改header
      if($rheaders['Content-Type']!="")
        header('Content-Type: '.$rheaders['Content-Type']);
        echo     $conntent;
    //    foreach($rheaders as $k => $v)echo "$k: $v<br/>";
    }else
    {
        //若是是302,301之类跳转的话，继续取跳转的
        if($rheaders["httpstatus"]>=300&&$rheaders["httpstatus"]<=400){
                list($rheaders,$conntent)=request_url("","","get",$rheaders["Location"],array("User-Agent"=> $user_agent),array());       
                if($rheaders["httpstatus"]>=200&&$rheaders["httpstatus"]<=300)
                {
                 //根据返回的类型，修改header
                 if($rheaders['Content-Type'])
                        header('Content-Type: '.$rheaders['Content-Type']);
                    echo     $conntent;
                }
        }
        //    foreach($rheaders as $k => $v)echo "$k: $v<br/>";
    }
    /*
     * 模拟get,post方法向服务器请求某url的内容，返回内容和状态码
     * 参数: $ip:url所在的服务器ip或者域名，当传入为空时，ip的默认值就是$aURL里包含host(ip或者域名)
             $port:int,url所在的服务器的端口,当传入为空时，ip的默认值就是$aURL里包含端口，若是没有的话为80
             $method:get还是post，缺省为post
             $aURL:请求的url,格式为http://username:password@hostname:port/path?arg=value#anchor
             $headers:数组,需要模拟的http头部(Referer,Content-Disposition,Expires,Cookie,Pragma,User-Agent,Accept-Language等等)
                           $headers=array("Referer"=>"http://123.com","User-Agent"=>"Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.10)");
             $aParamsArray:数组,需要post或者get的参数
                           $aParamsArray=array("id"=>123,"name"=>"abc");
     * 返回值:数组：第一个元素为返回的http头部数组(http状态(默认为0,连接错误为-1)),第二个为返回的内容
            
    */
    function request_url($ip,$port,$method,$aURL,$headers,$aParamsArray)
    {
        $rheaders=array();
         $rheaders["httpstatus"]=0;
        //分解URL为host,端口，和路径
        $URL=parse_url($aURL);
        if(!$port)
        {
            //缺省端口为80
            $port=($URL["port"]? $URL["port"]:80);   
        }
        if(strcasecmp($method,"get")==0){
            $method="GET";
        }else{
            $method="POST";
        }
        //把post的数据放到数据段里
        foreach($aParamsArray as $key=> $value)
        {
         if($flag!=0)
         {
         $params.="&";
         $flag=1;
         }
         $params.=$key."=";
         $params.=urlencode($value);
         $flag=1;
        }
            if($method=="POST")
            {
         //获得数据段长度，放入Content-Length
         $length=strlen($params);

             }else
             {
              $length=0;
              //把数据放到url的参数后面
              $URL["query"]=$URL["query"]."&".$params;
             }
             if($URL["query"]){
                 //添加参数
                 $URL["path"].="?".$URL["query"].($URL["fragment"]?"#".$URL["fragment"]:"");
             }
         //创建socket连接
         $fp=fsockopen($ip==""? $URL["host"]:$ip,$port,$errno,$errstr,10);
         if(!$fp)
         {
              $rheaders["httpstatus"]=-1;
                 return array($rheaders,$errstr."--->".$errno);
         }
         //去掉不多余的头部
         unset($headers['Host']);
         unset($headers['Content-Length']);
         unset($headers['Content-Type']);
         //构造post请求的头
         $header="$method ".$URL["path"]." HTTP/1.1rn";
         $header.="Host:".$URL["host"]."rn";
         foreach($headers as $k=> $v){
             $header.="$k:$vrn";
         }
         if(!$header["Content-Type"]){
         $header.="Content-Type:application/x-www-form-urlencodedrn";
              }
         $header.="Content-Length:".$length."rn";
         $header.="Connection:Closernrn";
         if($method=="POST")
             {
             //添加post的字符串
             $header.=$params."rn";
         }
    //     echo $header;
         //发送post的数据
         fputs($fp,$header);
         $inheader=1;
         $lineno=0;
         $conntent="";

         while(!feof($fp))
         {
              if($inheader){
             $line=fgets($fp,1024);//读取header
             }else{
                 if($rheaders["Content-Length"]>=0){
                     $line=fread($fp,$rheaders["Content-Length"]);//读取返回内容
                 }else{
                     $line=fread($fp,1024);//读取返回内容   
                 }
             }
         $lineno++;
         if($inheader){
             if($lineno==1)
             {
                     //从第一行,获取返回的状态码
                     if(preg_match("/^HTTP/1.[1|0] (d{3})/i",$line,$match)){
                         $rheaders["httpstatus"]=$match[1];
                     }
             }
         //解析http头部,把所有字段
             if(preg_match("/^(.*): (.*)$/i",$line,$matches)){
                            $rheaders[$matches[1]]=$matches[2];
             }
         }
         if($inheader&&($line=="n"||$line=="rn")){
         $inheader=0;
         continue;
         }
         if($inheader==0)
         {
             //获得返回内容
         $conntent.=$line;
         }
         }
        fclose($fp);
        return array($rheaders,$conntent);
    }
?>