md5()

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i have a q regarding the md5() function. I wanted to use this function to determine wheater 2 strings equal or not. How could it be that i use md5("string") and it return something and then i use md5("string") again (in a object this time) and it return a different value.

I might got the sense of md5 wrong but why does this function act like that, or how could i perform such a "cryption" which crypts a certain string exactly like his copy in all given circumstances.

thanks in advance

ali

[Anon]

md5() returns the same MD5 hash for the same string every time (in mathematics terminology, I'd say it's a "single-valued function").

So if it's returning different hashes, then it must be getting different strings to hash.