Bug #60528 [Opn->Bgs]: EG(precision) affects round function's behavior

Edit report at https://bugs.php.net/bug.php?id=60528&edit=1 ID: 60528 Updated by: laruence@php.net Reported by: laruence@php.net Summary: EG(precision) affects round function's behavior -Status: Open +Status: Bogus Type: Bug Package: *General Issues PHP Version: 5.3.8 Block user comment: N Private report: N New Comment: Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. Previous Comments: ------------------------------------------------------------------------ [2011-12-15 10:11:34] laruence@php.net hmm, seems you are right, I should close this. ------------------------------------------------------------------------ [2011-12-15 09:55:16] bobwei9 at hotmail dot com $ php -dprecision=20 -r 'echo 1.22;' outputs: 1.2199999999999999734 I think it's only the floating point imprecision and not round()-specific. ------------------------------------------------------------------------ [2011-12-15 03:03:28] laruence@php.net Description: ------------ as doc said: precision: The number of significant digits displayed in floating point numbers. so precision suppose to only affect the display format of a float; but the fact is: $php -dprecision=14 -r 'echo round(1.22, 2);' 1.22 php -dprecision=20 -r 'echo round(1.22, 2);' 1.2199999999999999734 the eg(precision) affected the round result. Test script: --------------- $php -dprecision=14 -r 'echo round(1.22, 2);' php -dprecision=20 -r 'echo round(1.22, 2);' Expected result: ---------------- 1.22 1.22 Actual result: -------------- 1.22 1.2199999999999999734 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=60528&edit=1