Req #30934 [Com]: Special keyword 'self' inherited in child classes

Edit report at https://bugs.php.net/bug.php?id=30934&edit=1 ID: 30934 Comment by: jeff at goblinoid dot co dot uk Reported by: jbs at fromru dot com Summary: Special keyword 'self' inherited in child classes Status: Not a bug Type: Feature/Change Request Package: Feature/Change Request Operating System: * PHP Version: 5.* Assigned To: andi Block user comment: N Private report: N New Comment: $this doesn't work for static methods, using static:: instead of self:: will cause the binding to be done at runtime, and work as required. http://php.net/manual/en/language.oop5.late-static-bindings.php Previous Comments: ------------------------------------------------------------------------ [2011-02-04 19:50:39] tim at gurka dot se The problem in the original comment could be avoided by using $this instead of self. ------------------------------------------------------------------------ [2005-04-27 18:59:52] andi@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php This is expected behavior. self:: binds statically to its class (to the best of my knowledge other languages like C++ don't support this either as they require to explicitly use the class name). There are actually advantages also to this approach as they allow you to protect and encapsulate functinality. ------------------------------------------------------------------------ [2005-04-25 21:14:45] helly@php.net >> First 'self' is bound at compile time (that's the way >> OOP works). >Thats how Java works. Not All OO Languages do. PHP is a >dynamic language It is not really a matter of performance here. It is just a different model of acting. And it is the way static works correct. If you read the example outline, you'll find out that it cannot work in a different way. The only thing one can do here is to eventually add what you want somehow. ------------------------------------------------------------------------ [2005-04-25 10:39:54] php-bugs at foomatic dot net > First 'self' is bound at compile time (that's the way OOP works). Thats how Java works. Not All OO Languages do. PHP is a dynamic language, and shouldn't really suffer a significant performance hit by binding at run time (Especially considering it's still compiled, thus bound, for every single request anyway). > what you want is something like 'called_class' As long as it's bound at runtime, I don't particuarly care what it's called. :-). ------------------------------------------------------------------------ [2005-04-25 07:49:05] helly@php.net First 'self' is bound at compile time (that's the way OOP works). Second what you want is something like 'called_class'. Assume you have a static private member in your base class and a static function and your derived class does not overload that function. If now your static function is called with the derived class and 'self' would be changed to the requested behavior php won't be able to access the property. Thus you want an additional info maybe called 'used_class'. Third to allow what you need a major change is needed that would slow down php - every part of php code execution. And that will take a while. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=30934 -- Edit this bug report at https://bugs.php.net/bug.php?id=30934&edit=1