使用curl给出垃圾值的PHP图像保存

I am trying to save images using PHP code using cURL.

function scaleImageAndSaveIt($appName,$imageURL)
{
    $format=time();
    print_r($format);
    //$strf=strftime($format);
    $imageLocnName = $appName . "_" . $format ;
    $ch = curl_init($imageURL);
    print_r($imageURL);
    $fp = fopen($imageLocnName, 'wb');
    curl_setopt($ch, CURLOPT_FILE, $fp);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    //exit;
    curl_exec($ch);
    curl_close($ch);
    fclose($fp);
}

when i am running this in browser it is giving garbage values on the screen and not saving the image also.

how do i save the image and what are those garbage values.

IMAGE LINK