Question

I always cannot be sure about this when comes to generating the unique number in php.

Is time() more unique than mt_rand()?

time() seems to be more unique to me because a time-date cannot be repeated twice in time.

mt_rand() I am not sure about the unique integer offers by php’s default – will an unique integer be repeated in time?

Answer 1

Have you considered uniqid() ?

Also, to answer your actual question: mt_rand will definitely eventually repeat a number, unlike time(). However, you can only use time() once a second if you want it to be unique.