note 51961 added to language.oop5.abstract

If you inherit from an abstract class, any method in the abstract class marked as abstract *must* be implemented by the extending class. For example, in the following abstract class: <?php abstract class AbstractClass { public function setup() {} abstract public function doSomething(); } ?> the method 'doSomething' must be defined in the extending class. Thus, the following does *not* work: <?php class ConcreteClass extends AbstractClass { public function doMyOwnThing() {} } ?> But the following *will*: <?php class ConcreteClass extends AbstractClass { public function doMyOwnThing() {} public function doSomething() {} } ?> The lesson to learn here: if the method is truly optional to the implementation, either do not define it in the abstract class at all, or do not tag it as abstract. ---- Manual Page -- http://www.php.net/manual/en/language.oop5.abstract.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+51961 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+51961&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+51961&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+51961&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+51961&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+51961&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+51961&report=yes Search -- http://master.php.net/manage/user-notes.php