#20365 [Opn->Bgs]: the modulo operator % doesn't work with negative integers!

ID: 20365 Updated by: derick@php.net Reported By: Ernest@Beinrohr.sk -Status: Open +Status: Bogus Bug Type: Math related Operating System: linux PHP Version: 4.2.2 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 No, it should be -4. If even BC says it who are we to go into that? Previous Comments: ------------------------------------------------------------------------ [2002-11-11 11:09:47] Ernest@Beinrohr.sk Yes, you are right, the output is not NULL, it's -4. BUT, it should be 6. PS: but bc gives -4 too, now I do not understand. I suppose, BC is wrong too. It should be 6. [ -4=6 (mod 10) ] ------------------------------------------------------------------------ [2002-11-11 09:53:41] sniper@php.net Please try using this CVS snapshot: http://snaps.php.net/php4-latest.tar.gz For Windows: http://snaps.php.net/win32/php4-win32-latest.zip works fine here too..(with 4.3.0-dev) so try the snapshot. ------------------------------------------------------------------------ [2002-11-11 09:51:16] derick@php.net Works fine (it should output -4): [derick@kossu derick]$ php <?php $a = -4 % 10; var_dump($a); ?> int(-4) Please provide a short script that reproduces this problem. Derick ------------------------------------------------------------------------ [2002-11-11 09:40:40] Ernest@Beinrohr.sk PHP's modulo operator cannot work with negative numbers. The positive ones work fine, but modulo is defined also on negatives ;-) ex: 10%3 = 1 [php gives 1] -4%10 = 6 [php gives NULL] ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=20365&edit=1