The distribution of mt_rand() return values is biased towards even numbers on 64-bit builds of PHP when max is beyond 2^32. This is because if max is greater than the value returned by mt_getrandmax(), the output of the random number generator must be scaled up.
edit: this post went from 5 points to 1, which I don't care about(in ~500 days I posted less than 10 times and I have ~35 points), but who downvotes documentation, seriously? -_-
see: http://php.net/manual/en/function.mt-rand.php
Under caution:
The distribution of mt_rand() return values is biased towards even numbers on 64-bit builds of PHP when max is beyond 2^32. This is because if max is greater than the value returned by mt_getrandmax(), the output of the random number generator must be scaled up.
edit: this post went from 5 points to 1, which I don't care about(in ~500 days I posted less than 10 times and I have ~35 points), but who downvotes documentation, seriously? -_-