Edit report at http://bugs.php.net/bug.php?id=40880&edit=1
ID: 40880 Comment by: robertoblanko at gmail dot com Reported by: prometheus__0 at hotmail dot com Summary: public->protected inheritance causes fatal Status: Bogus Type: Bug Package: Class/Object related Operating System: SUSE SLES 10 PHP Version: 5CVS-2007-03-21 (snap) Block user comment: N New Comment: Same problem here. You cannot actually apply the singleton pattern to subclasses with this behavior. I do not see any reason for not calling this a bug. Previous Comments: ------------------------------------------------------------------------ [2010-09-07 12:58:35] nickyla83 at yahoo dot fr I'm in the same situation as our friend "prometheus" here, I am trying to use a singleton pattern and logically, this should involve being able to encapsulate the subcalasses information particularly setting up a private constructor for the singleton subclass, IT DEFINITELY DOES MAKE SENSE, so please try to take this under consideration for the next php engine release. ------------------------------------------------------------------------ [2007-03-21 10:05:25] prometheus__0 at hotmail dot com is this the 'php'-dev definition? i'm asking cause wraping a singleton pattern around a subclass makes sense and the same example is valid for java and c++ to ask it differently: why is it working this way in php? (i'm interested in the background of this) my point is that 2 languages allow it and there is an example which is valid, not? ------------------------------------------------------------------------ [2007-03-21 09:43:47] der...@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 how it works... you can always open up an API through a new extended interface, but not hide more. ------------------------------------------------------------------------ [2007-03-21 09:38:19] prometheus__0 at hotmail dot com Description: ------------ (1) It is not possible to make inherited functions more private, which seems like a bug to me but (2) it is possible to make inherited functions more public, which shouldn't be possible, afaik. The example code causes the fatal (1) if you change protected function __construct() to public function __construct() from class b and public function __construct(){ to protected function __construct(){ from class a it works (2) since i'm not an expert in oop i tried the same example in java and it works the complete opposite way (the b functions can be more private but not more public) and in C++ it's the same i know bug report http://bugs.php.net/bug.php?id=34237 but it considers point (2) point (1) is still a bug in my opinion Reproduce code: --------------- <?php class a{ public function __construct(){ print("public construct\n"); } } class b extends a{ protected function __construct(){ print("protected construct\n"); } public static function getInstance(){ return new b(); } } $b = b::getInstance(); ?> Expected result: ---------------- protected construct Actual result: -------------- Fatal error: Access level to b::__construct() must be public (as in class a) in PHPDocument2 on line 16 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=40880&edit=1
