#28442 [NEW]: Changing a static variables in a class changes it across sub/super classes.

From: kell_pt at users dot sf dot net Operating system: any PHP version: 5CVS-2004-05-19 (dev) PHP Bug Type: Zend Engine 2 problem Bug description: Changing a static variables in a class changes it across sub/super classes. Description: ------------ It isn't possible to override static variable values in classes, seeing as the same variable is shared across the whole hierarchy of classes. Each child class should be able to have their own value for a static variable. A good example is trying to have a counter of the number of instances per class. ClassB::$count will always be the same as ClassA::$count. It is possible that you don't consider this a bug, but it is quite against the OOP paradigm, and worth a note. Basically, when loading a subclass, the default values for the variables should be loaded, and a new variable (memory space) created, instead of keeping a reference to the superclass' static variable. This is somehow related to Bug #16245 (which regards static variables declared within functions). But where the behaviour in such a situation is a bit unspecified, in this case it's quite against OO programming. Reproduce code: --------------- class ClassA { static $count; static $somevar; static __construct() { self::$count++; // this won't work as expected } } class ClassB extends ClassA { } // another simpler example ClassA::$somevar = 'A'; ClassB::$somevar = 'B'; // ClassA::$somevar is now 'B' instead of 'A'; ClassA::$somevar = 'A'; // ClassB::$somevar is now 'A' instead of 'B'; -- Edit bug report at http://bugs.php.net/?id=28442&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=28442&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=28442&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=28442&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=28442&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=28442&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=28442&r=needscript Try newer version: http://bugs.php.net/fix.php?id=28442&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=28442&r=support Expected behavior: http://bugs.php.net/fix.php?id=28442&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=28442&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=28442&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=28442&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=28442&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=28442&r=dst IIS Stability: http://bugs.php.net/fix.php?id=28442&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=28442&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=28442&r=float