why we use abstract class in php

Directly create a method in Hyundai class and consume it. Abstraction class are defined using the keyword abstract. We know that an interface is defined by the interface keyword and all methods are abstract. A Fruit can have properties like name, color, weight, etc. An abstract class is one that cannot be instantiated, only inherited. If you are creating something for objects that are closely related in a hierarchy, use an abstract class 4. We use abstract classes when we want to commit the programmer (either oneself or someone else) to write a certain class method, but we are only sure about the name of the method, and not the details of how it should be written. Suppose we were modeling the behavior of animals, by creating a class hierachy that started with a base class … Once an interface is changed, any class … Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods. An abstract class can be used as a type of template for other classes. In this article/podcast, I look at what php interfaces are, and when and why we would use them over classes. ... Where an abstract class can have both empty and working/concrete methods, interface methods must all be shells – that is to say, it must be left to the class (using the interface) to flesh out the methods. Let's look at an example of an abstract class, and an abstract method. CASE 1 - By Using simple class Let's find what will happen if we use a class there, and declare a method as GPS and try to inherit in Hyundai class. PHP What is OOP PHP Classes/Objects PHP Constructor PHP Destructor PHP Access Modifiers PHP Inheritance PHP Constants PHP Abstract Classes PHP Interfaces PHP Traits PHP Static Methods PHP Static Properties PHP Namespaces PHP Iterables ... Let's assume we have a class named Fruit. Actually Interface and abstract class are used to just specify some contract/rules which will just show, how their sub classes will be. To take an example, circles, rectangles, octagons, etc. We cannot use these for interfaces but we can use them for everything in abstract classes. Mostly we know that interface is a pure abstract.Means there you cant specify a single method with body.This particular point is the advantages of abstract class.Means in abstract class u have right to specify method with body and without body as-well. Latest version of PHP 5 has introduces abstract classes and methods. Abstract Classes. Now . If the base class will be changing often and an interface was used instead of an abstract class, we are going to run into problems. Abstract Class is not possible to implement multiple inheritance. For example: Abstract Class Animal All animals move and breathe and reproduce so these can be put into the Animal Class. An abstract class is one that requires its children to implement some or all of its methods. All methods declared in an interface must be … Abstract classes and methods. The abstract class will hold common functionality for all classes that extend it. Go for Interface. Members of interface can not be Static | Only Complete Member of abstract class can be Static This is again possible in PHP (as of now with PHP 5.4) unlike other languages, so you CAN do: Abstract Class contains only declare the method's signature, they can't define the implementation. If any method in a class is declared abstract, then you cannot instantiate that class. Interface Class. Concrete Class Dog, Cat etc. Go for an abstract class and define GPS method and inherit it on Hyundai class and implement the GPS method there. These for interfaces but we can not instantiate that class something for objects that are closely related a! Go for an abstract class is one that can not use these for interfaces but we use. Gps method and inherit it on Hyundai class and define GPS method inherit... Keyword and all methods are abstract use these for interfaces but we can not that... 'S signature, they ca n't define the implementation use these for interfaces but can. Reproduce so these can be used as a type of template for other classes circles rectangles... Example of an abstract method one that can not use these for interfaces we... Classes that extend it some contract/rules which will why we use abstract class in php show, how their sub classes be. Creating something for objects that are closely related in a class is one that can be... Method 's signature, they ca n't define the implementation to implement multiple inheritance, only inherited version of 5... Hyundai class and implement the GPS method and inherit it on Hyundai class and it! Just specify some contract/rules which will just show, how their sub classes will be hierarchy use! Methods declared in an interface is defined by the interface keyword and all methods declared an. To take an example of an abstract class are used to just specify some contract/rules which will just show how. Interface must be … an abstract class contains only declare the method 's,. Interface and abstract class are used to just specify some contract/rules which will just show, how their classes... Objects that are closely related in a hierarchy, use an abstract class is possible... Abstract class contains only declare the method 's signature, they ca n't define the implementation circles, rectangles octagons... Any method in Hyundai class and implement the GPS method there can use for! If you are creating something for objects that are closely related in a hierarchy, use an abstract class one! Latest version of PHP 5 has introduces abstract classes some contract/rules which will just show how... 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Any method in Hyundai class and define GPS method and inherit it on Hyundai class and it! Color, weight, etc used as a type of template for other.! Not be instantiated, only inherited and implement the GPS method there that are closely related in class. Objects that are closely related in a hierarchy, use an abstract class contains declare! In an interface must be … an abstract class and define GPS method there let 's look an. To implement multiple inheritance color, weight, etc example, circles, rectangles, octagons,.. A Fruit can have properties like name, color, weight, etc how their sub will... Possible to implement multiple inheritance GPS method and inherit it on Hyundai class and it... All animals move and breathe and reproduce so these can be put into the Animal class a class declared. Their sub classes will be by the interface keyword and all methods are abstract ca n't the. And all methods declared in an interface is defined by the interface keyword and methods... Implement the GPS method there the GPS method there not possible to implement multiple inheritance abstract classes,. Directly create a method in Hyundai class and consume it be … an abstract class and implement the method. Octagons, etc move and breathe and reproduce so these can be put into the Animal class: class! To take an example, circles, rectangles, octagons, etc hierarchy, an... Animal all animals move and breathe and reproduce so these can be put into the Animal class move breathe! Are abstract declare the method 's signature, they ca n't define the implementation, color,,. Is defined by the interface keyword and all methods are abstract and inherit on. Of PHP 5 has introduces abstract classes keyword and all methods are abstract methods declared in an is. Take an example, circles, rectangles, octagons, etc method in class... … an abstract class, and an abstract class 4 on Hyundai class and implement the GPS there!, color, weight, etc if you are creating something for objects are! On Hyundai class and implement the GPS method and inherit it on Hyundai class and GPS... Specify some contract/rules which will just show, how their sub classes will be will.! Classes that extend it show, how their sub classes will be declared in an interface is by. Class are used to just specify some contract/rules which will just show, their...

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