RE: [PHP] Unique random string

That´s a good approach! Using the time()-function in php would implement this nicely as it returns the number of seconds since the 1st January 1970. To avoid more than one user to register email-alias during the one-second interval it takes time() to increment, a table-lock could be issued and released after it´s been verified that the time() has in fact incremented one second. Happy Hacking, Henrik J. > ---------- > From: Dan[SMTP:dan@savage-comedy.com] > Sent: den 28 juni 2000 13:26 > To: php-general@lists.php.net > Subject: FW: [PHP] Unique random string > > Why not just have an integer that gets incremented. Represent it as a 14 > digit hex number. Use the 15th digit as a prefix for the year.. > 1AAAAAAAAAAA > is year one, 2AAAAAAAA is the second year, and so on. > > If you need to check them against previous strings, build a table for that > year of only the IDs you've generated with '1', the next year '2', > etc. It > should be a small subset of all of your random IDs. > > Dan Sevush > CTO Dan's Chocolates > Happy PHP site since 11/99 > www.danschocolates.com > > > > -----Original Message----- > > From: William Ahern [mailto:wahern@mailshell.com] > > Sent: Tuesday, June 27, 2000 7:35 PM > > To: php-general@lists.php.net > > Subject: [PHP] Unique random string > > > > > > Any ideas on how I can generate a 'guaranteed' unique ascii > > string less than > > 15 characters. > > > > It must be guaranteed unique across several independent > > servers. > > > > Currently we are generating random short strings to create > > unique aliases for > > email addresses. The only problem is that to guarantee > > uniqueness we keep a log > > of previous strings and check to make sure we don't create > > duplicates (we cannot > > rotate strings. They must be absolutely unqiue for the next > > decade or so). > > > > The optimal solution would be to generate strings that are > > truly unique and > > hopefully random enough, w/o having to go through the process > > of checking for > > duplicates. > > > > I'd use uniqid(), except that it is 32 characters (too long > > since users will > > have to handle them sometimes) and the algorithm must be > > available to C, C++, > > Perl, whatever. > > > > Any comments, suggestions or answers! ;) would be great. > > > > Please add my address to the reply as I am not subscribed to the list. > > > > TIA, > > > > Bill > > > > -- > > PHP General Mailing List (http://www.php.net/) > > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > > For additional commands, e-mail: php-general-help@lists.php.net > > To contact the list administrators, e-mail: > > php-list-admin@lists.php.net > > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net >