Eris\Random\MersenneTwister::twist PHP Method

    private function twist()
    {
        for ($i = 0; $i <= $this->n - 1; $i++) {
            $x = ($this->mt[$i] & $this->upperMask) + ($this->mt[($i + 1) % $this->n] & $this->lowerMask);
            assert('$x <= 0xffffffff');
            $xA = $x >> 1;
            assert('$xA <= 0x7fffffff');
            if ($x % 2 != 0) {
                $xA = $xA ^ $this->a;
            }
            $this->mt[$i] = $this->mt[($i + $this->m) % $this->n] ^ $xA;
        }
        $this->index = 0;
    }