Leafo\ScssPhp\Node\Number::output PHP Method

    public function output(Compiler $compiler = null)
    {
        $dimension = round($this->dimension, static::$precision);
        $units = array_filter($this->units, function ($unitSize) {
            return $unitSize;
        });
        if (count($units) > 1 && array_sum($units) === 0) {
            $dimension = $this->dimension;
            $units = [];
            $this->normalizeUnits($dimension, $units, 'in');
            $dimension = round($dimension, static::$precision);
            $units = array_filter($units, function ($unitSize) {
                return $unitSize;
            });
        }
        $unitSize = array_sum($units);
        if ($compiler && ($unitSize > 1 || $unitSize < 0 || count($units) > 1)) {
            $compiler->throwError((string) $dimension . $this->unitStr() . " isn't a valid CSS value.");
        }
        reset($units);
        list($unit, ) = each($units);
        return (string) $dimension . $unit;
    }