![]() It can have constants, members, method stubs (methods without a body), methods Now Let us see the difference between abstract class and interface. One can implement multiple interfaces, but not extend multiple classes (or abstract classes). Abstract classes that declare all their methods as abstract are not interfaces with different names.The signatures of the methods must match, optional parameter given in the child class will not be accepted and error will be shown.If the abstract method is defined as protected in the parent class, the function implementation must be defined as either protected or public, but not private.The child class which extends an abstract class must define all the methods of the abstract class.If a class has only one method as abstract, then that class must be an abstract class. ![]() Objects cannot be created for the abstract classes.There can be any number of methods in the class and we have to declare the class as abstract only when there is an abstract method.The abstract method is function declaration without anybody and it has the only name of the method and its parameters. An abstract class is a class that contains at least one abstract method.If we extend interface all the methods of the interface must be implemented in the child class.We cannot define a variable in an interface.We cannot create objects to interface, but the class implementing the interface can have objects.Interfaces can be extended like classes using the extends operator.Ģ) Interface can be extended with another interface using extends keyword.The class implementing the interface must use the exact same method signatures as are defined in the interface.All methods in the interface must be implemented within a class failure to do so will result in a fatal error.All methods declared in an interface must be public this is the nature of an interface.Interface is written in the same way as the class the declaration with interface keyword.An interface is a description of the actions that an object can do.MultiLevel Inheritance : In MultiLevel Inheritance, the parent class method will be inherited by child class and again subclass will inherit the child class method. Single Level Inheritance: In Single Level Inheritance the Parent class methods will be extended by the child class. When the same method of the parent class is inherited we call as inherited method. Now let us see types of inheritance supported in Object Oriented Programming and corresponding Php inheritance examples. The child class can inherit the parent method and give own method implementation, this property is called overridden method. When the properties and the methods of the parent class are accessed by the child class, we call the concept has inheritance. Also, look into how we can access object properties via variables When the object is created we can access the variables and method function of the class with the help of operator ‘->, accessing the method is done to get the information of that method. The object is created with the help of the new keyword. When class is created, we can create any number of objects in that class. In the basics of object-oriented, let see how to define a class and create an object: First we have to define a php class, where classname should be same as filename.Class is a programmer-defined data type, which includes local methods and local variables.The PHP Object-Oriented Programming concepts are: RELATED INSIGHT How to Propel Your Startup's Growth with Integrated Systems
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