ID: 45184
Updated by: pajoye@php.net
Reported By: kala at sankya dot com
-Status: No Feedback
+Status: Analyzed
Bug Type: Math related
Operating System: Linux
PHP Version: 5.2.6
-Assigned To:
+Assigned To: pajoye
Previous Comments:
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[2008-06-26 01:00:00] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
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[2008-06-18 16:21:40] pajoye@php.net
Would you be interested in improving our code?
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[2008-06-05 11:49:10] kala at sankya dot com
Sorry the line
int val = (i/divisor)*10;
in the example program should be :
int val = (i/divisor)*REQUESTED_RANGE;
for the program to work correctly for any other range other than 10.
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[2008-06-05 11:30:09] kala at sankya dot com
@pajoye : Yes I'm aware of the limitations of rand() (and LCG
generators in general), and have used MT extensively. The problem here
isn't with the RNG but with the algorithm used in converting the raw 31
bit random number to one within a given range. This algorithm is common
to both the rand() and mt_rand() functions that take min/max arguments
(both uses the RANGE_RANDOM macro defined in the file
"ext/standard/php_rand.h") . The only work around is to use the no
argument variant to get a 31 bit number and and do the scaling yourself.
(But obviously the better solution would be to fix the code itself :) )
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[2008-06-05 10:37:10] pajoye@php.net
Have you tried to use mt_rand instead?
Rand is known for having "issues".
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