Bug #55004 [Opn->Bgs]: Incorrect Modulus calculation

Edit report at http://bugs.php.net/bug.php?id=55004&edit=1 ID: 55004 Updated by: rasmus@php.net Reported by: dejagerc at gmail dot com Summary: Incorrect Modulus calculation -Status: Open +Status: Bogus Type: Bug Package: Math related Operating System: debian PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Floating point values have a limited precision. Hence a value might not have the same string representation after any processing. That also includes writing a floating point value in your script and directly printing it without any mathematical operations. If you would like to know more about "floats" and what IEEE 754 is, read this: http://www.floating-point-gui.de/ Thank you for your interest in PHP. . Previous Comments: ------------------------------------------------------------------------ [2011-06-06 20:38:22] dejagerc at gmail dot com Description: ------------ Modulus calculation not returning correct value as in the example. If I replace 1.001 with 1.002 it works correctly. Test script: --------------- <?php $in = 1.001; $in2 = $in * 1000 ; $decimal = $in2 % 10; echo $decimal; // Output 0 ( Wrong ) $in = 1001; $decimal = $in % 10; echo $decimal; // Output 1 ( Correct ) ?> ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=55004&edit=1