Req #76578 [NEW]: ** operator and negative base

From: amenshchikov at gmail dot com Operating system: Debian 9 PHP version: 7.2.7 Package: PHP Language Specification Bug Type: Feature/Change Request Bug description:** operator and negative base Description: ------------ --- From manual page: http://www.php.net/language.operators.arithmetic --- When I try to raise number -9 to the power of 0.5 (take a root of even degree), I have -3 as result. But I think that NaN should be a more correct in this case. Test script: --------------- echo -9**0.5; Expected result: ---------------- NAN Actual result: -------------- -3 -- Edit bug report at https://bugs.php.net/bug.php?id=76578&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=76578&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=76578&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=76578&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=76578&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=76578&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=76578&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=76578&r=needscript Try newer version: https://bugs.php.net/fix.php?id=76578&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=76578&r=support Expected behavior: https://bugs.php.net/fix.php?id=76578&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=76578&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=76578&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=76578&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=76578&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=76578&r=dst IIS Stability: https://bugs.php.net/fix.php?id=76578&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=76578&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=76578&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=76578&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=76578&r=mysqlcfg