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Algorithm?

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Algorithm? Software design forum discussing design principles and non-language specific algorithms. Get help with logic, algebraic, or relational concepts.

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  #1  
Old October 15th, 2003, 03:07 PM
Sotonin Sotonin is offline
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Algorithm?
Can't find the algorithm's forum guess it was removed?

I am looking for some script to create a random unique identifying number in this type of format

1234567-28

basically 7 random digits, then a number that is derived somehow by those digits. either adding them up, or factoring in the system time somehow to make it truely random. any ideas are welcome.
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Old October 15th, 2003, 03:09 PM
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not removed, only renamed
http://forums.devshed.com/f43/s
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Old October 15th, 2003, 03:17 PM
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Unlike this post, which was not renamed, but moved. To the Algorithms forum.
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Old October 15th, 2003, 03:23 PM
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lol
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Old October 15th, 2003, 05:26 PM
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Re: Algorithm?
Quote:
Originally posted by Sotonin
Can't find the algorithm's forum guess it was removed?

I am looking for some script to create a random unique identifying number in this type of format

1234567-28

basically 7 random digits, then a number that is derived somehow by those digits. either adding them up, or factoring in the system time somehow to make it truely random. any ideas are welcome.


Random and Unique? If it's truely random then it won't be unique. If it's truely unique then it won't be random...
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Old October 16th, 2003, 01:19 AM
M.Hirsch M.Hirsch is offline
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And if it comes from a software algorithm, it is not random either.
You need special hardware for true random numbers.

hth,
M.
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Old October 16th, 2003, 09:41 AM
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hmm ok. well, scratch the unique part.

What are some simple ways to generate this in php? And what should I base the last digits on?

I know this is a php question. why i put it in PHP in the first place. but o well it was moved.
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Old October 16th, 2003, 12:34 PM
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Use the mhash() and bin2hex() functions perhaps? See
http://www.php.net/manual/en/function.mhash.php for more. You can perhaps pass the current time to mhash(), to generate a unique key and then bin2hex the result to convert to hex digits:
$key = bin2hex(mhash(MHASH_MD5, time()));
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