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Bug #20102 wrong value on mod (%) function
Submitted: 2002-10-26 03:19 UTC Modified: 2002-10-26 14:37 UTC
From: hermawan at dmonster dot com Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 4.2.3 OS: Redhat Linux 7.3
Private report: No CVE-ID: None
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 [2002-10-26 03:19 UTC] hermawan at dmonster dot com 
When I try to mod some integer, it returns false value, it's different with the calculator. Here is the example :

<?php
  $int = 700000000;
  $modwith = 1000000000000;
  print $int%$modwith; // it return 700000000
                       // this is correnct.
  $int = 800000000;
  print $int%$modwith; // it return 72620032
                       // this is false, it supposed to be 800000000
?>

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 [2002-10-26 12:06 UTC] hholzgra@php.net 
your $modwidth value is way beyond the 
usable and valid range (unless you are
on a 64bit system ;)
 [2002-10-26 12:15 UTC] hermawan at dmonster dot com 
I found the replacement of mod (%) which can be used with out of range value. The function is :

    function mod ($a, $b) {
      $rtn = $a;
      while ($rtn > $b) {
         $rtn -= $b;
      }
      return $rtn;
    }

It works with my other script and returning the correct value. Please try it.
 [2002-10-26 14:37 UTC] hholzgra@php.net 
try 

<?php
  $modwith = 1000000000000;
  echo gettype($modwith);
?>

see?
 
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