Can abstract class implement interface in php?
In every example I've seen, extended classes implement the interfaces of their parents. For reference, the following example: Show
Is failure to implement an interface in a child, which is implemented by a parent, considered bad practice or something? Are there any technical drawbacks to omitting the implementation in the child? asked Jun 16, 2011 at 8:36
Dan LuggDan Lugg 19.7k18 gold badges107 silver badges172 bronze badges 3 I would consider that you are on the right path. There is no need to declare that you are implementing the interface, when extending a class that already answered Jun 16, 2011 at 8:41
Emil IvanovEmil Ivanov 36.7k12 gold badges73 silver badges90 bronze badges 1
I just can't answer your question better than this guy has:
Reference Thus, it's up to you to decide, based on who is going to use (instantiate) your classes, and who is going to write them. If you are the sole user and writer of your classes, then, maybe, just maybe, you don't need them both. But, if you want to give everyone a stripped down to core bits blueprint for the class writer(s) and class user(s), then you should consider using both abstracting and implementing. answered Jun 16, 2011 at 8:51
Maybe a little late to the table but I see the above comments do not clarify the main misunderstanding underlying the OP's question. So the underlying questions are:
But before some clarifications why to use either of the two above:
Here is an example for an Abstract and concrete classes.
Then the questions come:
The answers:
Finally, answer to the the OP question whether to use an Interface for an Abstract class or for the concrete class is:
answered Jun 2, 2018 at 9:35
Valentine ShiValentine Shi 5,4023 gold badges39 silver badges41 bronze badges
The child always implements the interface, it can not go around with this. I have no clue if that is bad practice or something. I would say it's a language feature.
You can not test the reflection of the abstract class for having the interface for example. However, abstract class are already an interface, so technically they themselves not really need the interface but you can do so to keep things fluid within the inheritance. answered Jun 16, 2011 at 8:45
hakrehakre 187k48 gold badges418 silver badges802 bronze badges Well, I was confused too, but I think you should use the latter one, You are right, If you implement the interface in the abstract class, then there is no need to write the interface, you can write the method in interface all into abstract as abstract methods, because you will extend the abstract class whatever, and you will have to use the abstract class as a param type when you use the class in other place, that's not a good thing, I think an abstract class should't be used as a param type, while an interface should be. answered Feb 5, 2018 at 8:43
Can an abstract class implements an interface?Java Abstract class can implement interfaces without even providing the implementation of interface methods. Java Abstract class is used to provide common method implementation to all the subclasses or to provide default implementation. We can run abstract class in java like any other class if it has main() method.
What is a class abstract class and interface in PHP?An interface class only contains incomplete members which refer to the signature of the member. Abstract class contains both incomplete(i.e. abstract) and complete members. Since everything is assumed to be public, an interface class does not have access modifiers by default.
Does abstract class have to implement all interface methods?Yes, it is mandatory to implement all the methods in a class that implements an interface until and unless that class is declared as an abstract class.
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