#32786 [NEW]: global on unset var messes up extract( , EXTR_SKIP)

From: mcrusch at svm dot vetmed dot wisc dot edu Operating system: Windows XP SP2 PHP version: 4CVS-2005-04-20 (stable) PHP Bug Type: Variables related Bug description: global on unset var messes up extract( , EXTR_SKIP) Description: ------------ I called extract($array, EXTR_SKIP) in the global scope on an array and one of the variables did not extract, even thought it was not set. I traced the problem to a function call in which there was a global statement involving the variable. This seems to have created the variable in the global scope, but isset($var) (in the global scope) and isset($GLOBALS["var"]) both return false. So, the variable is not set, but it will not extract. The only way to detect that it is in the symbol table is to do a print_r($GLOBALS), which allows you to visually see that it is there, but there is no way to programmatically detect it (other than capturing the output of print_r and parsing it--ugly!) Problem also occurs on a SuSE 9.3 Linux box (Linux kernel v. 2.6.5-7.147-smp) running PHP 4.3.9 Reproduce code: --------------- $arrayOfStuff = array("stuff" => "valueOfStuff"); echo isset($stuff).", ".isset($GLOBALS["stuff"]).", $stuff\n"; // Commenting out the globalStuff() call produces the // expected result globalStuff(); extract($arrayOfStuff, EXTR_SKIP); echo isset($stuff).", ".isset($GLOBALS["stuff"]).", $stuff\n"; function globalStuff() { global $stuff; } Expected result: ---------------- , , 1, 1, valueOfStuff Actual result: -------------- , , , , -- Edit bug report at http://bugs.php.net/?id=32786&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=32786&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=32786&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=32786&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=32786&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=32786&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=32786&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=32786&r=needscript Try newer version: http://bugs.php.net/fix.php?id=32786&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=32786&r=support Expected behavior: http://bugs.php.net/fix.php?id=32786&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=32786&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=32786&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=32786&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=32786&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=32786&r=dst IIS Stability: http://bugs.php.net/fix.php?id=32786&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=32786&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=32786&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=32786&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=32786&r=mysqlcfg