fsockopen exif_imagetype

$url = parse_url('https://site/file.jpg');
$host = $url['host'];
$port = $url['port'];
$path = $url['path'];
$query = $url['query'];
if(!$port)$port = 80 ;//tcp
$request = "GET $path HTTP/1.1\r\n"
          ."Host: $host\r\n"
          ."User-Agent: Mozilla/5.0\r\n"
          ."Connection: close\r\n"
          ."\r\n";
/////////////
$fp = ($url['scheme']=='https' )?
                                    fsockopen("ssl://{$host}", 443, $errno, $errstr, 30):
                                    fsockopen("tcp://{$host}", 80, $errno, $errstr, 30);

$imgName=tempnam(sys_get_temp_dir(),'img');
$hnd = fopen($imgName, 'w');
ob_start(function($buffer) use($hnd){fwrite($hnd, $buffer);}, 1);
$type=false;
$bStart=true;
if ( $fp  ) {
    if ( fwrite($fp, $request) ) {
        while ( !feof($fp) ) {
                 $out=fread($fp, 1024);
                 if($bStart){
                     echo $h=substr($out, strpos($out, "\r\n\r\n") + 4);
                    $type=exif_imagetype($imgName);
                    if($type==false)break;
                    $bStart=false;
                }else{
                    echo $out;
                }

        }
    }
    fclose($fp);

}
ob_end_clean();
fclose($hnd);
echo ($type);