Generating a unique ID in PHP

Question

I\'m trying to generate a unique ID in php in order to store user-uploaded content on a FS without conflicts. I\'m using php, and at the moment this little snippet is responsib

Answer 1

Since both uniqid() and rand() are functions based on the current time, rand() adds almost no entropy, since the time will change only a tiny amount between the respective calls.

As long as you use the more_entropy option, you should never have a collision within a single server. If you use clustering, be sure to include a prefix that differs between servers.