#40916 [Opn->Bgs]: var_dump is not the friend of float numbers

ID: 40916 Updated by: tony2001@php.net Reported By: cutmaster at fearlesss dot com -Status: Open +Status: Bogus Bug Type: Arrays related Operating System: Linux PHP Version: 5.2.1 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: ------------------------------------------------------------------------ [2007-03-26 08:02:26] cutmaster at fearlesss dot com Description: ------------ Using float in arrays with var_dump returns rounded results, which is definitly not the stored numbers... And if you try an echo sprintf('%.0f',$value[0]) you'll get the good value... Too bad :( Reproduce code: --------------- $value = array((float)"3700368445139",(float)"37003684447031"); var_dump($value); Expected result: ---------------- array(2) { [0]=> float(3700368445139) [1]=> float(37003684447031) } Actual result: -------------- array(2) { [0]=> float(3700368445140) [1]=> float(37003684447000) } ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=40916&edit=1