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Isn't uniqid() unique enough? If not, the function failed its purpose.
With md5() you only gain the possibility of a collision, i.e. the same (and therefore not-so-unique) hash for different input data but no increase in "uniqueness" (as if it's possible anyway )
kind of don't want to create file just for that one. token should be unique for each requests.
I don't want to rely on DB...and if not..there are some concurency problems etc that will have to be solved.