public function binary(): string
    {
        $hex = str_pad($this->numeric(16), static::NB_BITS / 4, '0', STR_PAD_LEFT);

        return pack('H*', $hex);
    }
public function binary(): string
    {
        $hex = str_pad($this->numeric(16), static::NB_BITS / 4, '0', STR_PAD_LEFT);

        return pack('H*', $hex);
    }
public function binary ( ) : string { $ hex = str_pad ( $ this -> numeric ( 16 ) , static :: NB_BITS / 4 , '0' , STR_PAD_LEFT ) ; return pack ( 'H*' , $ hex ) ; }
Return binary string representation.

@return string Binary string
Return binary string representation .