PHP intermediate uniqid in high concurrency repetition problem

Generate token check issues in utilities recent projects. First consider the PHP intermediate uniqid () function to generate a random string, but because the function is good like a microsecond-based level. In the case of high concurrency, the same value can be produced.

Solution 1:uniqid (rand (1,10000)), the first parameter of the function can be used to generate a prefix number, so, the repetition rate number.

But the odds are still there, repeatedly.

Solution 2:md5 (Uniqid ()), using the MD5 () function. Produce absolutely unique values

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PHP intermediate uniqid in high concurrency repetition problem