Bug #78187 [NEW]: Exponentiation operator gives incorrect result

From: francis dot crossen at gmail dot com Operating system: n/a PHP version: 7.3.6 Package: *Math Functions Bug Type: Bug Bug description:Exponentiation operator gives incorrect result Description: ------------ Tested in PHP shell on Linux and Windows Test script: --------------- <?php // expect 1 echo -1 * -1 . PHP_EOL; echo pow(-1, 2) . PHP_EOL; echo -1 ** 2 . PHP_EOL; // expect 49 echo -7 * -7 . PHP_EOL; echo pow(-7, 2) . PHP_EOL; echo -7 ** 2 . PHP_EOL; -- Edit bug report at https://bugs.php.net/bug.php?id=78187&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=78187&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=78187&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=78187&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=78187&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78187&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78187&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78187&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78187&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78187&r=support Expected behavior: https://bugs.php.net/fix.php?id=78187&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78187&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78187&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78187&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=78187&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=78187&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78187&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78187&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78187&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78187&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78187&r=mysqlcfg