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写了一个区间段修改的逻辑，这个注释能打几分！
source link: https://www.v2ex.com/t/484999
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PHP - @DavidNineRoc - 在写一个日期不同而价格不同的数据库设计，用每日一条记录会简单一点。现在用的是时间段的。最小单位是一天。如果当天临时变，采用日记记录表。****代码有点多，换成贴图，格式好看一点。因
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