lib/BN.php
public function iuxor(BN $num) {
        $this->bi = $this->bi->binaryXor($num->bi);
        return $this;
    }
public function iuxor(BN $num) {
        $this->bi = $this->bi->binaryXor($num->bi);
        return $this;
    }
public function iuxor ( BN $ num ) { $ this -> bi = $ this -> bi -> binaryXor ( $ num -> bi ) ; return $ this ; }
Xor `num` with `this` in-place
Xor num with this in - place