ID: 46879 Updated by: der...@php.net Reported By: php at thwien dot de -Status: Open +Status: Bogus Bug Type: Variables related Operating System: Linux-Debian 4.0 PHP Version: 5.2CVS-2008-12-16 (snap) 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://docs.sun.com/source/806-3568/ncg_goldberg.html Thank you for your interest in PHP. . Previous Comments: ------------------------------------------------------------------------ [2008-12-16 11:24:06] php at thwien dot de Description: ------------ Float comparison after addition isn't precise always. Reproduce code: --------------- $floatTotal = 19.99 + 39.99; print ($floatTotal - 59.98); Expected result: ---------------- 0 Actual result: -------------- 7.105427357601E-15 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=46879&edit=1
