Re: mt_rand() - the same forever?

On Sun, Oct 5, 2008 at 10:05 PM, Ashley Sheridan <ash@ashleysheridan.co.uk> wrote: > On Sun, 2008-10-05 at 21:57 +0200, Janek wrote: >> I know, but I *want* to seed it. My goal is to have a fixed >> pseudorandom sequence for each integer (seed) and I don't want those >> sequences to change regarding PHP version. >> >> Janek >> >> On Sun, Oct 5, 2008 at 9:52 PM, Richard Heyes <richard@php.net> wrote: >> >> I wonder whether I can rely on the stability of mt_srand() and >> >> mt_rand(). I want them to generate the same sequence for a fixed seed, >> >> regardless of PHP version. Do you think I can trust it? >> >> Janek >> > >> > Keep in mind (if you're not already) that mt_rand() doesn't >> > technically need to be seeded. >> > >> > -- >> > Richard Heyes >> > >> > HTML5 Graphing for FF, Chrome, Opera and Safari: >> > http://www.phpguru.org/RGraph >> > >> > Doesn't it also rely on the system clock as well? > > > Ash > www.ashleysheridan.co.uk > > No. When I give a fixed seed to mt_srand(), each time I get the same sequence of mt_rand()s. My question is wheather the actual algorithm behind these functions is likely to change in the next version of PHP or not. Janek