Bug #75938 [NEW]: Modulus value not stored in variable

From: php at darkain dot com Operating system: Debian 9.3 PHP version: 7.2.2 Package: Scripting Engine problem Bug Type: Bug Bug description:Modulus value not stored in variable Description: ------------ Using this combination of code, $mod remains INT 0 instead of being set to INT 1. The wrapped var_dump however shows the proper value still. I've tested this code on my Debian box with: PHP 7.2.2-1+0~20180205160742.18+stretch~1.gbpb78b58 On my test machine, php cli works properly. However, php fpm shows this particular error. My guess is that this is somewhere in the optimizer. Changing or removing any line prior to the first var_dump will result in proper output. Changing the values from variables to constant will result in proper output. Changing the modulus operator to any other operator will result in a proper output. Test script: --------------- function borken($columns) { $columns = (int) $columns; if ($columns < 1) return 0; $count = count([1,2,3,4,5]); var_dump($mod = ($count % $columns)); var_dump($mod); } borken(2); Expected result: ---------------- int(1) int(1) Actual result: -------------- int(1) int(0) -- Edit bug report at https://bugs.php.net/bug.php?id=75938&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75938&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75938&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75938&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75938&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75938&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75938&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75938&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75938&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75938&r=support Expected behavior: https://bugs.php.net/fix.php?id=75938&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75938&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75938&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75938&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75938&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75938&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75938&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75938&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75938&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75938&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75938&r=mysqlcfg