Question

Hi I have made this code for my project.

uniqid().date('ymdhis').rand();

How unique is this?

Is it unique enough to prevent any possible collisions?
Even for big sites with astronomical number of daily file submissions?

Or should I add more functions?
(I don’t want to because the output is already quite long.)

Thanks.

Answer 1

Depending on what language you are using (i assume it is php)
it is more then enough.

uniqid() is a command that generates a id based on a timestamp, making sure that it won’t output a string twice.
so only the uniqid() would already suffice