function get_url_file($file_source, $file_target) {

    $fp = fopen($file_target, 'w'); // 파일

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $file_source);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, false);

    curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);

    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);

    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.1 Safari/537.11');

    curl_setopt($ch, CURLOPT_FILE, $fp);

    curl_exec($ch);

    curl_close($ch);

    if(is_file($file_target)) {

        $size = @getimagesize($file_target);

        if($size[2] < 1 || $size[2] > 3) {

            @unlink($file_target);

        } else {

            return true;

        }

    }

    return false;

}