Bug #60528 [Com]: EG(precision) affects round function's behavior

Edit report at https://bugs.php.net/bug.php?id=60528&edit=1 ID: 60528 Comment by: bobwei9 at hotmail dot com Reported by: laruence@php.net Summary: EG(precision) affects round function's behavior Status: Open Type: Bug Package: *General Issues PHP Version: 5.3.8 Block user comment: N Private report: N New Comment: $ php -dprecision=20 -r 'echo 1.22;' outputs: 1.2199999999999999734 I think it's only the floating point imprecision and not round()-specific. Previous Comments: ------------------------------------------------------------------------ [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