PHP实现保质期计算器

1.php实现保质期计算， 保质期日期可选，天 、月、年

 2. laravel示例

    /**
     * 保质期计算器
     * @return void
     */
    public function expirationDateCal()
    {
        $produce_date = $this->request('produce_date');             // 生产日期
        $warranty_date = $this->request('warranty_date');           // 保质期
        $type = $this->request('type');                             // 类型 day month year

        switch ($type) {
            case "day":
                $date = date('Y-m-d', strtotime("+{$warranty_date} day", strtotime($produce_date)));
                $exp_date = date('Y-m-d', strtotime("-1 day", strtotime($date)));
                break;
            case "month":
                $date = date('Y-m-d', strtotime("+{$warranty_date} month", strtotime($produce_date)));
                $exp_date = date('Y-m-d', strtotime("-1 day", strtotime($date)));
                break;
            case "year":
                $date = date('Y-m-d', strtotime("+{$warranty_date} year", strtotime($produce_date)));
                $exp_date = date('Y-m-d', strtotime("-1 day", strtotime($date)));
                break;
            default:
                $exp_date = 0;
        }

        $exp_status = time() >= strtotime($exp_date) ? '已过期' : '未过期';

        return $this->jsonSuc(['result' => ['exp_date' => $exp_date, 'exp_status' => $exp_status] ?? []]);
    }