php计算2个日期的差值函数分享

/**
     *    日期-计算2个日期的差值
     *  @return int
     */
    public function get_difference($date, $new_date) {
        $date = strtotime($date);
        $new_date = strtotime($new_date);
        return abs(ceil(($date - $new_date)/86400));
    }