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Request #32145 Mersenne Twister seed option required
Submitted: 2005-03-01 10:25 UTC Modified: 2016-12-30 22:48 UTC
Votes:2
Avg. Score:3.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: hardeman at nmni dot net Assigned:
Status: Open Package: Math related
PHP Version: All versions OS: All OS
Private report: No CVE-ID: None
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 [2005-03-01 10:25 UTC] hardeman at nmni dot net
Description:
------------
Unless the PHP documentation is not up-to-date, the only seed option for the Mersenne Twister RNG is a 32-bit integer. The original (updated) MT implementation (see http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/emt19937ar.html), however, allows for seed arrays of arbitrary length to better exploit the large period of the RNG. It would be nice if this option were built in in future versions of PHP so that I myself and probably quite a few other PHP users won't have to implement the RNG in PHP code itself or create a private extension in C++. Adding this feature to PHP should not require a lot of effort as other implementations are readily available.


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1e8bPhq.out (last revision 2013-12-12 18:40 UTC) by bebymiss at yahoo dot co dot uk)

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 [2005-03-04 15:33 UTC] hardeman at nmni dot net
As a temporary solution, I have now created a PHP class which implements the Mersenne Twister PRNG with the updated initialization methods. I can make this class available to other PHP users - just send me a mail.

Hendrik Hardeman
 [2016-12-30 22:48 UTC] cmb@php.net
-Package: Feature/Change Request +Package: Math related
 
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