public function isKanji(string $string):bool{
		$i   = 0;
		$len = \strlen($string);

		while($i + 1 < $len){
			$c = ((0xff&\ord($string[$i])) << 8)|(0xff&\ord($string[$i + 1]));

			if(!($c >= 0x8140 && $c <= 0x9FFC) && !($c >= 0xE040 && $c <= 0xEBBF)){
				return false;
			}

			$i += 2;
		}

		return $i >= $len;
	}