Bug #65420 [Opn->Nab]: Comparison with double values wrong

Edit report at https://bugs.php.net/bug.php?id=65420&edit=1 ID: 65420 Updated by: rasmus@php.net Reported by: g dot karagyozov at gmail dot com Summary: Comparison with double values wrong -Status: Open +Status: Not a bug Type: Bug Package: Apache related Operating System: OSX PHP Version: 5.5.1 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: ------------------------------------------------------------------------ [2013-08-08 08:52:19] g dot karagyozov at gmail dot com Description: ------------ Comparison with some double values is not correct. Test script: --------------- var_dump(1.8 > (1.9 - 0.1)); var_dump(1.1 > (1.2 - 0.1)); Expected result: ---------------- false expected Actual result: -------------- true returned ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=65420&edit=1