#43572 [Fbk->Opn]: fmod($a,$b) wrong when $b is a multiple of $a

ID: 43572 User updated by: csaba at alum dot mit dot edu Reported By: csaba at alum dot mit dot edu -Status: Feedback +Status: Open Bug Type: Math related Operating System: Win XP PHP Version: 5.2.5 New Comment: Just to be clear: fmod(9.75,1.625) => 0 Expected, and works correctly for me. php -n -r "echo fmod(6.5, 1.3);" => 1.3 which is not correct (0 is correct) Csaba Note that on windows systems, double quotes are needed (because of the space) instead of the single quotes. Previous Comments: ------------------------------------------------------------------------ [2007-12-12 09:52:14] jani@php.net Try this with CLI: php -n -r 'echo fmod(9.75,1.625);' ------------------------------------------------------------------------ [2007-12-12 09:51:33] jani@php.net Works fine for me on Linux. ------------------------------------------------------------------------ [2007-12-12 00:55:39] csaba at alum dot mit dot edu 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 this bug report at http://bugs.php.net/?id=43572&edit=1