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关于php ID相近就错开一定数写入的有关问题

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Release： 2016-06-13 12:17:12
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关于php ID相近就错开一定数写入的问题
一个座位表，一个学生表

座位表：
ID   zid    userid

学生表：
userid   cityid


现在想把学生表中的学生随机写入座位表，座位表zid是2位数字的座位号

比如学生表有20个学生，其中5个城市cityid相同，5个cityid相同的学生要在座位表zid中错开5个位这样，如何才能实现？

一个安排考试用的PHP，目的是防止城市cityid相同的学生座位相近做弊

先谢谢了！
------解决思路----------------------
错开5个位 是指间隔在 5 个及以上，还是指间隔 4 个就可以？
如果是前者，那么 5 个 cityid 相同的学生就不可能同时出现在 20 人的教室中

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