如何从PHP中的随机数生成器获取种子值

Question

I would like to get the seed value after the rand() or mt_rand() is used. Essentially I want to store the seed so that I can use this seed to continue generating random numbers next time php is executed.

I need a repeatable behavior for unit testing/load testing... and different modules in my applications will use the same seed, so that the sequence of random numbers are generated are reproducible.

Thanks for your input. I couldn't find a method to get the seed. A Random number generator class that exposes the seed would be helpful too.

Answer 1

如果您需要可重复的行为，则应使用srand()或mt_srand()自己为rand()或mt_rand()设置种子，并存储使用的种子。

Answer 2

AFAIK知道使用的种子的唯一方法是自己指定种子。

Answer 3

mt_srand($known_value)

将您的种子设置为可重复的值