Polymorphism in PHP Explained [With Examples]

Polymorphism in PHP Explained [With Examples]

Polymorphism in PHP allows you to example write methods with similar names that perform the same actions in different classes. We will understand the concept with a polymorphic example in PHP. Polymorphism in PHP can be inheritance by either the use of interfaces or abstract classes. Polymorphism in PHP Explained [With Examples]

The  PHP programming language follows an  object-oriented programming (OOP) paradigm, along with other base structures. One of the most significant features of OOPs is polymorphism. In general terms, polymorphism is derived from Greek words poly meaning many and morphism meaning forms. Polymorphism in OOPs is a concept that allows you to create classes with different functionalities in a single interface.

Generally, it is of two types: compile-time (overloading) and run time (overriding), but polymorphism in PHP does not support overloading, or in other words, compile-time polymorphism. The most significant benefit of polymorphism in PHP is that you don’t have to worry about the technicalities of defining which code is written in which class, as all will be used in the same way.

An easy-to-understand example of  object-oriented PHP polymorphism is the area of different geometric shapes. There are many shapes with different lengths, widths, radius, and other parameters, but all the figures will have an area. Don’t worry if you didn’t understand it, as we will look at various polymorphism examples in PHP to understand better the concept and how to implement it.

How to Implement Polymorphism in PHP?

Polymorphism in PHP can be implemented by either the use of interfaces or abstract classes. We will look at examples to enforce it in both ways.

Polymorphism Example in PHP to Implement in Interfaces

You can consider the interface as a blueprint for all the classes that extend it. They are similar to classes with just a single primary difference. You can declare and define method names and arguments within interfaces, but you cannot write method code. Any class implementing an interface will implement all its methods. The syntax of an interface is:

interface exampleInterface{

public function methodName();

}

Since now you know about interfaces, let’s look at how to implement polymorphism in PHP in an interface.

<?php

interface ShapeExmp{

public function calcArea();

}

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