#49377 [Opn->Bgs]: number_format and decimal numbers

ID: 49377 Updated by: derick@php.net Reported By: matt at mx-dev dot net -Status: Open +Status: Bogus Bug Type: Math related Operating System: Windows 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: ------------------------------------------------------------------------ [2009-08-26 16:12:46] matt at mx-dev dot net Description: ------------ I've encountered a bug using the number_format function with a high decimal value. Actually, an approximative number appear randomly if the decimal number is greater than 30. I think that the bug can be reproduced being a little bit sticky. I succeeded to reproduce this bug with the following code : number_format(25, 49, ',', ' '); Reproduce code: --------------- echo number_format(15, 50, ',', ' '); Expected result: ---------------- 15,00000000000000000000000000000000000000000000000000 Actual result: -------------- 14,99999999999999822364316059974953532218933105468750 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=49377&edit=1