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Bug #2887 mt_rand(int min, int max) doesn't seem to use min and max
Submitted: 1999-12-01 15:39 UTC Modified: 2000-05-22 14:14 UTC
From: mikeuser at hotmail dot com Assigned:
Status: Closed Package: Misbehaving function
PHP Version: 3.0.11 OS: WinNT
Private report: No CVE-ID: None
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From: mikeuser at hotmail dot com
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 [1999-12-01 15:39 UTC] mikeuser at hotmail dot com 
BUG! (WinNT)<BR>

Setting min-max range doesn't work! I get values well beyond range.
<PRE>
echo "<B>mt_rand(0,20)=".mt_rand(0,20)."</B><BR>";


Actual results:
mt_rand(0,20)=879286
mt_rand(0,20)=1357383
mt_rand(0,20)=286308
etc...
</PRE>

A work-around using the % operator:

<PRE>
$randnum = $mt_rand() % ($maxVal-$minVal) + minVal;
</PRE>

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AllCommentsChangesGit/SVN commitsRelated reports
 [2000-05-22 14:14 UTC] hholzgra at cvs dot php dot net 
mt_rand() divided by RAND_MAX instead of MT_RAND_MAX
on some platforms, espc. win32, theese are not
equal, and so the results are to low/high

fixed in CVS, PHP4 version was OK
 
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