titanscssc::expToString PHP Method

    protected function expToString($exp)
    {
        list(, $op, $left, $right, $inParens, $whiteLeft, $whiteRight) = $exp;
        $content = array($this->reduce($left));
        if ($whiteLeft) {
            $content[] = " ";
        }
        $content[] = $op;
        if ($whiteRight) {
            $content[] = " ";
        }
        $content[] = $this->reduce($right);
        return array("string", "", $content);
    }