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

ID: 32786 User updated by: mcrusch at svm dot vetmed dot wisc dot edu Reported By: mcrusch at svm dot vetmed dot wisc dot edu Status: Open Bug Type: Variables related Operating System: Windows XP SP2 PHP Version: 4CVS-2005-04-20 (stable) New Comment: SuSE version is 9.1, sorry. Previous Comments: ------------------------------------------------------------------------ [2005-04-20 23:52:08] mcrusch at svm dot vetmed dot wisc dot edu 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 this bug report at http://bugs.php.net/?id=32786&edit=1