Bug #63136 [NEW]: pow() returns NaN where base is negative and exponent is an odd number root

From: tstobbe at sacbee dot com Operating system: Linux (fc17, 32-bit) PHP version: 5.4.7 Package: Math related Bug Type: Bug Bug description:pow() returns NaN where base is negative and exponent is an odd number root Description: ------------ Odd roots (3, 5, etc) of negative numbers passed to pow() result in NaN rather than the actual result. While this makes sense for even numbered roots (sqrt and what-not), it wrecks havoc on any system that actually uses arbitrary roots of negative numbers. Example: -2*-2*-2 = -8; pow(-8, 1/3) should return -2 Test script: --------------- var_dump(pow(-8, 1/3)); Expected result: ---------------- float(-2) Actual result: -------------- float(NAN) -- Edit bug report at https://bugs.php.net/bug.php?id=63136&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=63136&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=63136&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=63136&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=63136&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=63136&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=63136&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=63136&r=needscript Try newer version: https://bugs.php.net/fix.php?id=63136&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=63136&r=support Expected behavior: https://bugs.php.net/fix.php?id=63136&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=63136&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=63136&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=63136&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=63136&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=63136&r=dst IIS Stability: https://bugs.php.net/fix.php?id=63136&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=63136&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=63136&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=63136&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=63136&r=mysqlcfg