/** * Get modulus of an arbitrary precision number * * @param string $n The left operand, as a string. * @param string $d The modulus, as a string. * @access public * @return string Returns the modulus as a string, or <b>NULL</b> if modulus is 0. */ public function mod($n, $d) { $n = new Math_BigInteger($n); $d = new Math_BigInteger($d); return $n->_mod2($d); }