Is it safe to use time() to generate a unique id number?

My thinking is that the call to the server will take enough time that no 
two users will  get the same time stamp (although they may be very 
close). Even though the likelyhood of  two users entering at the same 
time is very slim, I don't want to take the chance.

What about microtime()?

Steven J. Walker
Walker Effects

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