#41583 [Bgs]: number_format() return unexpected number for big number

ID: 41583 User updated by: info at qwerq dot com Reported By: info at qwerq dot com Status: Bogus Bug Type: Strings related Operating System: windows XP PHP Version: 4.4.7 New Comment: Thanks your information and that link was very helpful, so I guess it's not PHP bug but it's my fault. :) Previous Comments: ------------------------------------------------------------------------ [2007-06-04 10:17:52] tony2001@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://docs.sun.com/source/806-3568/ncg_goldberg.html Thank you for your interest in PHP. ------------------------------------------------------------------------ [2007-06-04 10:05:45] info at qwerq dot com Description: ------------ My PHP version is 5.1.6 specifically, number_format() return unexpected result for big number Reproduce code: --------------- echo number_format(2000000000000000000000000, 0,'.',' '); Expected result: ---------------- 2 000 000 000 000 000 000 000 000 Actual result: -------------- 2 000 000 000 000 001 200 000 000 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=41583&edit=1