public function stringCompare($string_a, $string_b)
	{
		$diff = strlen($string_a) ^ strlen($string_b);

		for ($i = 0; $i < strlen($string_a) && $i < strlen($string_b); $i++)
		{
			$diff |= ord($string_a[$i]) ^ ord($string_b[$i]);
		}

		return $diff === 0;
	}