public static function getRandomString(int $length): string {
		
		// list of available chars for random string
		$availableChars = '123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVXYWZ';
		
		// create a random string
		return substr(str_shuffle($availableChars . $availableChars), 0, $length);
		
	}