RE: [PHP] Random string

It really depends on how many of these strings you need. If you have an 8 character string consisting only of alphanumerics then there would be 62^8 permutations, which is about 2.2E14. So say you wanted to produce 1 million of these things the chances of any two of them being the same would be 2.2E8. - Jason Wong Digital View Ltd 2201 Nanyang Plaza 57 Hung To Road Kwun Tong HONG KONG Tel: +852-2861-3615 Fax: +852-2520-2987 www.digitalview.com > -----Original Message----- > From: n e t b r a i n [mailto:net-brain@net-brain.net] > Sent: 16 September 2000 01:24 > To: Jason Wong > Subject: R: [PHP] Random string > > > Hi Jason, > > > Here's something that I've used: > > > > $new_password = substr(md5(uniqid(rand())), 0, 8); > > Well, this was the first idea which has come to my mind, but > ... if about > md5(uniqid(rand())) I'm quite sure that is a safe & unique > string 32 chars > long, can I say the same if I trunk it in brutal way with > substr()? Is it > real a unique string? > > Suggestion are very welcome > max >