#43572 [NEW]: fmod($a,$b) wrong when $b is a multiple of $a

From: csaba at alum dot mit dot edu Operating system: Win XP PHP version: 5.2.5 PHP Bug Type: Math related Bug description: fmod($a,$b) wrong when $b is a multiple of $a Description: ------------ if $div evenly divides $num, fmod($num, $div) still returns a value not equal to 0 for almost all decimal $div, where the decimal portion is not n/2^k for some n and k. e.g. fmod(9.75,1.625) => 0 because .125 is 5/2^3 Expected result: ---------------- I expect to see fmod return 0 when the 1st argument is a multiple of the 2nd. Csaba Gabor from Vienna Actual result: -------------- fmod(6.5, 1.3) => 1.3 which is incorrect -- Edit bug report at http://bugs.php.net/?id=43572&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=43572&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=43572&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=43572&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=43572&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=43572&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=43572&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=43572&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=43572&r=needscript Try newer version: http://bugs.php.net/fix.php?id=43572&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=43572&r=support Expected behavior: http://bugs.php.net/fix.php?id=43572&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=43572&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=43572&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=43572&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=43572&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=43572&r=dst IIS Stability: http://bugs.php.net/fix.php?id=43572&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=43572&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=43572&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=43572&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=43572&r=mysqlcfg