#47107 [Bgs]: numbers with more than 15 digits are not behaved normally

ID: 47107 User updated by: mucahitkahveci at gmail dot com Reported By: mucahitkahveci at gmail dot com Status: Bogus Bug Type: Scripting Engine problem Operating System: Windows xp sp2 -PHP Version: 5.2.8 +PHP Version: 5.2.2 New Comment: I understand that, but isn't it a big problem? Since php supports integers for "maximum value of about two billion" (php manual) in which it than changes to floating point numbers for numbers bigger than this. So for any value its bigger than 15 digit its a very very big problem while querying in a database. For example mysql has bigint type which supports a maximum of 20 digits. But because of this behaviour of php we have to use only upto 15 digits!! And if someone skips this detail it would cause problems that is impossible to solve Thanks Previous Comments: ------------------------------------------------------------------------ [2009-01-15 12:48:30] jani@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. And 32bit issue..etc. etc. No bug. ------------------------------------------------------------------------ [2009-01-14 19:57:52] mucahitkahveci at gmail dot com Description: ------------ printf('%f', 55555555555555555555); prints 55555555555555557376.000000 This number (555...) has 20 digits this happen in any number with more than 15 digits Reproduce code: --------------- printf('%f', 55555555555555555555); Expected result: ---------------- 55555555555555555555.000000 Actual result: -------------- 55555555555555557376.000000 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=47107&edit=1