How to solve the duplication problem of uniqid in PHP under high concurrency

The problem with generating token checksums is useful in recent projects. First consider using the Uniqid () function in PHP to generate random strings, but because the function seems to be based on the microsecond time level. In the case of high concurrency, it is possible to generate the same value.

Solution 1:uniqid (rand (1,10000)), the first parameter of the function can be used as a prefix for the number of generators, thus greatly reducing the repetition rate of the number of builds. But the likelihood of repetition is still there.

Solution 2:md5 (Uniqid ()), using the MD5 () function, to generate an absolutely unique value

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