Bug #52894 [Opn->Bgs]: number_format fails with large values

Edit report at http://bugs.php.net/bug.php?id=52894&edit=1 ID: 52894 Updated by: rasmus@php.net Reported by: info at tellmatic dot org Summary: number_format fails with large values -Status: Open +Status: Bogus Type: Bug Package: *Math Functions Operating System: linux PHP Version: 5.2.14 Block user comment: 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://docs.sun.com/source/806-3568/ncg_goldberg.html Thank you for your interest in PHP. . Previous Comments: ------------------------------------------------------------------------ [2010-09-20 17:53:57] info at tellmatic dot org Description: ------------ wrong output, not as give, drifts a lot! Test script: --------------- number_format("1234.560000", 50, '.', ''); Expected result: ---------------- expected output should be 1234.56 with additional 48 zeros! and not a 'random value'. Actual result: -------------- == 1234.55999999999994543031789362430572509765625000000000 ???? can't be! ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=52894&edit=1