Answer by Rahul K for Custom video thumbnails using YouTube API?

  //CONVERT IMAGE FROM URL AND STORE    $randomstr = generateRandomString();    $thumbnail_url = "http://i.ytimg.com/vi/BMFLzf-DXXU/hqdefault.jpg";       $ch = curl_init($thumbnail_url);    $fp = fopen('videos/'.$randomstr.'.jpg', 'wb');    curl_setopt($ch, CURLOPT_FILE, $fp);    curl_setopt($ch, CURLOPT_HEADER, 0);    curl_exec($ch);    curl_close($ch);    fclose($fp);