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Bug #7281 rand() gives range warnings over 15 bits
Submitted: 2000-10-17 11:26 UTC Modified: 2000-11-10 14:54 UTC
From: a dot schommer at dialogmedien dot de Assigned:
Status: Closed Package: Math related
PHP Version: 4.0.2 OS: Solaris 2.7
Private report: No CVE-ID: None
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From: a dot schommer at dialogmedien dot de
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 [2000-10-17 11:26 UTC] a dot schommer at dialogmedien dot de 
rand() should work on int, which is about 2 billion. But i get
Warning: rand(): Invalid range: 1000000..1032768 in /tmp/apa2/htdocs/admin/tst.php3 on line 1

For this code:
<? print rand (1000000, 1032768); ?>
(a result is given anyway)

Not the size, but the difference seems to matter: If it exceeds 2^15-1, the warning comes up:
<? print rand (1000000, 1032767); ?>
produces only a result

sizeof(int) really is 4.
So i don't think it's my fault.

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 [2000-11-10 14:54 UTC] hholzgra@php.net 
this is system dependant , on Solaris 2.7 you have

./stdlib.h:#define      RAND_MAX        32767

so that's it

you can always use the PHP function getrandmax() 
to find out the max. difference between the min and max
parameters for your system
 
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