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php?积分兑换,该怎么处理

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Release： 2016-06-13 12:24:32
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php?积分兑换
2014年1月
用户A通过XXXXX编号兑换了1000积分  (这1000积分的有效期为1年)
2014年1月
用户A用800积分兑换了礼品 (剩下200积分)
2015年1月
用户A一年前没用完的积分过期
而我的计算是 200-1000=-800  

要怎么判断用些过期的积分用了多少??
------解决思路----------------------
如果积分是有时限的，那么在兑换积分的同时要保存失效日期

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