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PHP中的uniqid在高并发下的重复有关问题

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Release： 2016-06-13 12:03:17
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PHP中的uniqid在高并发下的重复问题

最近项目中有用到生成token校验的问题。首先考虑用php中的uniqid()函数生成随机串，但是由于该函数好似基于微秒时间级别的。在高并发的情况下，就有可能会生成相同的值。

解决方案1：uniqid(rand(1,10000)), 该函数的第一个参数可用作生成数的前缀，如此，大大降低了生成数的重复率。但是重复的可能性还是存在的

解决方案2：md5(uniqid()),  使用md5()函数，可生成绝对唯一的值

1楼ranxiedao53分钟前
之前做后端的时候也发现这个问题，短时间内快速生成的时候重复率很高，甚至达到了20%，于是就自己写方法生成，将数组字母随机生成，比如生成8位，这样重复的概率会低好多，比PHP自带的好一些，感觉这个方法就是个坑，随机种子发生器和时间相关
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