ID: 47106 Updated by: johan...@php.net Reported By: rico dot moorman at gmail dot com -Status: Open +Status: Bogus Bug Type: Feature/Change Request Operating System: Linux PHP Version: 5.2.8 New Comment:
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 The derived intrface must fullfill the "is-a" relationship, you can add optional paramters, but all calls which are allowed with the parent have to be allowed with the extended interface, too. Previous Comments: ------------------------------------------------------------------------ [2009-01-14 19:05:55] rico dot moorman at gmail dot com Description: ------------ With interfaces we are given the possibility to extend them too. We may define additional methods. But while it's possible to add new methods it's not possible to change the method signatures. Within the "normal" class hierarchy on the other hand it's possible though. Adding this to the Interface implementation would surely lead to more overall flexibility of the Interfaces/abstracts. Reproduce code: --------------- // interfaces to test with interface MillableInterface { } interface StoneInterface extends MillableInterface { } interface WheatInterface extends MillableInterface { } // works actually class Mill { function mill(MillableInterface $stuff) {} } class StoneMill extends Mill { function mill(StoneInterface $stuff) {} } class WheatMill extends Mill { function mill(WheatInterface $stuff) {} } // doesn't work interface MillInterface { function mill(MillableInterface $stuff); } interface StoneMillInterface extends MillInterface { function mill(StoneInterface $stuff); } interface WheatMillInterface extends MillInterface { function mill(WheatInterface $stuff); } Expected result: ---------------- no fatals ... just a working interface check Actual result: -------------- Fatal error: Can't inherit abstract function MillInterface::mill() (previously declared abstract in StoneMillInterface) in /home/rico/dingen.php on line 29 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=47106&edit=1
