php 通过fsockopen模拟表单post提交

<？PHP            
    $flag = 0;        
    //要post的数据         
$argv = array(        
     'var1'=>'教程',         
     'var2'=>'码农');         
//构造要post的字符串         
foreach ($argv as $key=>$value) {         
     if ($flag!=0) {        
             $params .= "&";         
             $flag = 1;         
     }         
     $params.= $key."="; $params.= urlencode($value);         
     $flag = 1;         
     }         
     $length = strlen($params);        
         //创建socket连接         
     $fp = fsockopen("127.0.0.1",80,$errno,$errstr,10) or exit($errstr."--->".$errno);         
     //构造post请求的头         
     $header = "POST /mobile/try.php HTTP/1.1";         
     $header .= "Host:127.0.0.1";         
     $header .= "Referer:/mobile/sendpost.php";         
     $header .= "Content-Type: application/x-www-form-urlencoded";         
     $header .= "Content-Length: ".$length."";         
     $header .= "Connection: Close";        
     //添加post的字符串         
     $header .= $params."";         
     //发送post的数据         
     fputs($fp,$header);         
     $inheader = 1;         
     while (!feof($fp)) {        
             $line = fgets($fp,1024); //去除请求包的头只显示页面的返回数据         
             if ($inheader && ($line == "n" || $line == "")) {        
                 $inheader = 0;         
             }         
             if ($inheader == 0) {         
                 echo $line;         
             }         
     }         
fclose($fp);         
?>