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Bug #25650 Bad number return by % operator
Submitted: 2003-09-25 02:19 UTC Modified: 2003-09-25 10:14 UTC
From: jserrano at cutb dot edu dot co Assigned:
Status: Not a bug Package: Math related
PHP Version: 4.3.1 OS: Mandrake 9.1
Private report: No CVE-ID: None
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From: jserrano at cutb dot edu dot co
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 [2003-09-25 02:19 UTC] jserrano at cutb dot edu dot co
Description:
------------
the Operator % (modular division) return a erroneous result.

Reproduce code:
---------------
 $a = 63522;
 $b = 62186;
 echo "a = 63522\n";
 echo "b = 62186\n";
 echo $num."\n";
 $mod = ($a*$b) % 65536;
 echo "mod = $mod";


Expected result:
----------------
 $a = 63522;
 $b = 62186;
 $num = $a*$b;
 echo $num."\n";
 $p = $num/65536;
 echo (int)$p."\n";
 $num = $num-((int)$p*65536);
 echo "re-mod = $num";


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 [2003-09-25 10:14 UTC] pollita@php.net
63522 * 61826 is greater than the largest possible value for an integer on a 32-bit system (2147483647).

In order to work with values of this size you must either use the bcmath or gmp functions, or upgrade to a 64-bit processor.
 
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