#25751 [NEW]: pow() function return errors

From: dbjm at comcast dot net Operating system: Windows 2000 & Linux 9 PHP version: 4.3.2 PHP Bug Type: Math related Bug description: pow() function return errors Description: ------------ The pow() function returns incorrect numbers when using a negative number base. This is not a crisis to fix for me - I have worked around it. Thanks for the great work on developing PHP. Sincerely, Dave Reproduce code: --------------- echo "pow(3.125, 3.125) = " . pow(3.125, 3.125). "<br>"; echo "pow(-3.125, 3.125) = " . pow(-3.125, 3.125). "<br>"; echo "pow(3.125, -3.125) = " . pow(3.125, -3.125). "<br>"; echo "pow(-3.125, -3.125) = " . pow(-3.125, -3.125). "<br>"; Expected result: ---------------- When the same calcualtion is made using Visual Basic the results are: 3.125 ^ 3.125 = 35.1889507775869 -3.125 ^ 3.125 = -35.1889507775869 3.125 ^ -3.125 = 2.84180112763389E-02 -3.125 ^ -3.125 = -2.84180112763389E-02 Actual result: -------------- Windows 2000: pow(3.125, 3.125) = 35.1889507776 pow(-3.125, 3.125) = -1.#IND pow(3.125, -3.125) = 0.0284180112763 pow(-3.125, -3.125) = -1.#IND Linux 9: pow(3.125, 3.125) = 35.188950777587 pow(-3.125, 3.125) = NAN pow(3.125, -3.125) = 0.028418011276339 pow(-3.125, -3.125) = NAN -- Edit bug report at http://bugs.php.net/?id=25751&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=25751&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=25751&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=25751&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=25751&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=25751&r=needtrace Try newer version: http://bugs.php.net/fix.php?id=25751&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=25751&r=support Expected behavior: http://bugs.php.net/fix.php?id=25751&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=25751&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=25751&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=25751&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=25751&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=25751&r=dst IIS Stability: http://bugs.php.net/fix.php?id=25751&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=25751&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=25751&r=float