Edit report at https://bugs.php.net/bug.php?id=64543&edit=1
ID: 64543 Updated by: ni...@php.net Reported by: dev at medifirst dot fr Summary: Incorrect result of round -Status: Open +Status: Not a bug Type: Bug Package: Math related Operating System: Linux or Windows PHP Version: 5.4.13 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. "precision" is the display precision. If you increase it you start seeing the rounding errors inherent to the floating point type. Previous Comments: ------------------------------------------------------------------------ [2013-03-28 16:28:55] dev at medifirst dot fr Description: ------------ The "round" function returns a bad value if "precision" > 17. Test script: --------------- php.ini precision = 20 php -r "echo round(5.554, 2)" Expected result: ---------------- 5.55 is the expected value Actual result: -------------- 5.5499999999999998224 is the incorrect result ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=64543&edit=1
