#42418 [Opn->Bgs]: Strange behaviour of modulus function

ID: 42418 Updated by: iliaa@php.net Reported By: onyjgyjz at trashmail dot net -Status: Open +Status: Bogus Bug Type: Math related Operating System: WinXP PHP Version: 5.2.3 New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php 11213214321 overflows an integer and is converted into a negative number. The modulus operation is then performed on a negative value, hence the -1 return value. Previous Comments: ------------------------------------------------------------------------ [2007-08-24 19:45:39] onyjgyjz at trashmail dot net Description: ------------ Somehow the modulus operator does not behave as expected on some special numbers.(maybe integer overflow or something like that?) Php-version i used: PHP 5.2.3 (cli) (built: May 31 2007 09:37:22) Copyright (c) 1997-2007 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies Reproduce code: --------------- $a=11213214321; echo $a % 2; Expected result: ---------------- Output of: 1 Actual result: -------------- Output of: -1 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=42418&edit=1