Bug #79443 [Com]: round with precision is not rounding

Edit report at https://bugs.php.net/bug.php?id=79443&edit=1 ID: 79443 Comment by: info at globules dot io Reported by: info at globules dot io Summary: round with precision is not rounding Status: Not a bug Type: Bug Package: *General Issues Operating System: Windows 10 x64 PHP Version: 7.4.4 Assigned To: cmb Block user comment: N Private report: N New Comment: How is this not a bug? This is the exact code. I'm rounding with precision, it works on Linux, doesn't work on Windows. Previous Comments: ------------------------------------------------------------------------ [2020-04-01 16:06:34] info at globules dot io Yes I have posted the exact code. ------------------------------------------------------------------------ [2020-04-01 15:48:07] danack@php.net Mr Info Are you sure that code you posted is actually the code that's producing that output? https://3v4l.org/v9k54 ------------------------------------------------------------------------ [2020-04-01 15:44:09] cmb@php.net 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. ------------------------------------------------------------------------ [2020-04-01 15:41:50] info at globules dot io Description: ------------ round with precision is not rounding Test script: --------------- echo round(-80.0035326999999938, 6); Expected result: ---------------- -80.003533 Actual result: -------------- -80.0035330000000044 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79443&edit=1