ID: 49300 Updated by: der...@php.net Reported By: looris at gmail dot com -Status: Open +Status: Bogus Bug Type: Unknown/Other Function Operating System: debian stable PHP Version: 5.2.10 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: ------------------------------------------------------------------------ [2009-08-19 20:39:01] looris at gmail dot com Description: ------------ Just look at the code. Reproduce code: --------------- <?php for ($value=0.1; $value<0.6; $value+=0.1) { echo $value."\n"; } echo "\n"; for ($value=0.1; $value<0.8; $value+=0.1) { echo $value."\n"; } ?> Expected result: ---------------- 0.1 0.2 0.3 0.4 0.5 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Actual result: -------------- 0.1 0.2 0.3 0.4 0.5 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=49300&edit=1
