Need for predictable random generator

Question

I\'m a web-game developer and I got a problem with random numbers. Let\'s say that a player has 20% chance to get a critical hit with his sword. That means, 1 out of 5 hits

Answer 1

mt_rand() is based on a Mersenne Twister implementation, which means it yields one of the best random distributions you can get.

Apparently what you want is not randomness at all, so you should start out specifying exactly what you want. You'll probably realize you have conflicting expectations - that the results should be truely random and not predictable, yet at the same time they should not exhibit local variations from the stated probability - but then it becomes predictable. If you set a maximum of 10 non-crits in a row, then you've just told players "if you've had 9 non-crits in a row, the next one will be critical with 100% certainty" - you might as well not bother with randomness at all.