Re: GUID or any other unique IDs

On Tue, October 25, 2005 4:01 am, Denis Gerasimov wrote: > I am in a need of GUID generator but it seems that PHP doesn't have > this as > a built-in feature. There is some discussion here you may find useful: http://www.php.net/uniqid > I really need "true" unique identifiers - md5() hash is not OK because > of > the "birthday paradox". If you already have a database connection you can simply use a sequence (or auto_increment in MySQL) But that assumes you are willing to have predictable IDs, which you might not. > Can anyone recommend a way for solving this trouble? You could use md5() and track every ID you hand out in a UNIQUE column in a db, and simply generate another random md5() if you happen to run into a duplicate. The probability that you'd generate too many duplicate random md5()s in a row for performance to be an issue is pretty small, if you already have database activity going on. -- Like Music? http://l-i-e.com/artists.htm