将PHP uniqid用于文件名是否安全？ 它们总是独一无二的吗？

Question

I want to use PHPs uniqid() function to create a filename for image upload.

There will be only one person uploading images and they can only upload one at a time. I don't care that the filename can be reverse engineered to get the time because it's just a filename.

Is uniqid 100% unique for my use case?

Answer 1

Try to use something like below:

md5(rand(1,1000000).uniqid(mt_rand(), true))

This code piece had already increased uniqueness.