PHP simulates post to send data

 $flag = 0;
 //Data to be posted
$argv = array(
 'var1'=>'abc',
 'var2'=>'How are you');
//Construct post String
foreach ($argv as $key=>$value) {
 if ($flag!=0) {
 $params .= "&";
 $flag = 1;
 }
 $params.= $ key."="; $params.= urlencode($value);
 $flag = 1;
 }
 $length = strlen($params);
 //Create a socket connection
 $fp = fsockopen("127.0.0.1 ",80,$errno,$errstr,10) or exit($errstr."--->".$errno);
 //Construct the header of the post request
 $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";
 //Add the post string
 $header .= $params. "";
 //Send post data
 fputs($fp,$header);
 $inheader = 1;
 while (!feof($fp)) {
 $line = fgets($fp,1024); / /Remove the header of the request packet and only display the return data of the page
 if ($inheader && ($line == "n" || $line == "")) {
 $inheader = 0;
 }
 if ($inheader == 0) {
 echo $line;
 }
 }
fclose($fp);
?>

php, post