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In this article, we’ll see Object Oriented PHP.

As web applications become more complex, writing clean, scalable, and maintainable code is no longer optional—it’s essential. This is where Object Oriented PHP Programming (OOP) becomes incredibly valuable.

Object Oriented PHP allows developers to organize code into reusable components called classes and objects, making development faster, more structured, and easier to maintain. Modern PHP frameworks like Laravel, Symfony, and Magento heavily rely on OOP concepts.

In this guide, we’ll explore everything you need to know about Object Oriented PHP in 2026—from basic concepts to advanced features, real-world usage, and best practices.

What is an Object Oriented PHP?

Object oriented PHP programming (OOP) is a programming paradigm that uses objects to model real-world entities. Objects are made up of data (properties) and behavior (methods).

PHP is a general-purpose programming language that can be used to create a variety of applications, including websites, web applications, and command-line scripts. PHP supports OOP, and it is a popular choice for developers who want to create complex and scalable applications.

object oriented PHP concept is used to make powerful, robust, and secure programming instructions.

With any language reference, there are only three basic object oriented php concepts.

1. Encapsulation and data abstraction
2. Inheritance
3. Polymorphism

Advantages of ­OOPs

• Real-world programming
• Ability to simulate real-world events much more effectively.
• Reusable of code
• Information hiding
• Programmers are able to reach their goals faster.

Benefits of Object Oriented PHP

Using OOP in PHP offers several advantages:

1. Reusability

You can reuse classes across multiple parts of your application, reducing duplication.

2. Encapsulation

Data is protected within classes using access modifiers, improving security.

3. Abstraction

Hides complex logic and exposes only necessary functionality.

4. Polymorphism

Allows one interface to be used for different data types, making code flexible.

5. Maintainability

Structured code is easier to debug, update, and scale

Object and Class in PHP

What is Class:

• Class is a blueprint of related data members(proerties/variable) and methods(function).
• Classes are the fundamental construct behind oops.
• Class is a self-contained independent collection of variables and functions, which work together to perform one or more specific related tasks.

Note: Variables within a class are called properties and functions are called methods.

How to define a class

Class always starts with the “class” keyword. After this write the class name without parentheses.

Syntax

class demo
	{
	  code to be executed
	}

Example:

class Demo {
public $name;

public function sayHello() {
return "Hello " . $this->name;
}
}

What are Objects

• The object is the instance of the class.
• Once a class has been defined, objects can be created from the class through “new” keyword.
• class methods and properties can directly be accessed through this object instance.
• Connector(Dot operator->) symbol used to connect objects to their properties or methods.

Note: You can not access any property of the class without their object>

Syntax

$obj= new demo();

$obj = new Demo();
$obj->name = "Umang";

echo $obj->sayHello(); // Output: Hello Umang

class Test {
public $value = 10;

public function showValue() {
return $this->value;
}
}

Predefine Constructor

Php introduce a new functionality to define a constructor i.e __construct().By using this function we can define a constructor. it is known
as a predefined constructor. It’s better than a user-defined constructor because if we change the class name then user. defined constructor treated as normal method.

Note: if predefined constructor and user-defined constructor, both defined in the same class, then predefined constructor work properly while the user
defined constructor treated as normal method.

Destructor in PHP

The destructor method will be called as soon as there are no other references to a particular object, or in any order during the shutdown sequence.

Note: _ _destruct() is used to define destructor.

Encapsulation in PHP

Encapsulation is a concept of wrapping up or binding up related data members and methods

in a single module known as encapsulation

And hiding the essential internal property of that module known as data abstraction.

class BankAccount {
private $balance = 0;

public function deposit($amount) {
$this->balance += $amount;
}

public function getBalance() {
return $this->balance;
}
}

Inheritance in PHP

Inheritance is a mechanism of extending an existing class by inheriting a class we create a new class with all functionality of that existing class, and we can add new members to the new class.

When we inherit one class from another we say that the inherited class is a subclass and the class that has been inherited is called parent class.

We declare a new class with additional keyword extends.

Note: Php only supports multilevel inheritance.

class ParentClass {
public function message() {
return "This is parent class";
}
}

class ChildClass extends ParentClass {
public function childMessage() {
return "This is child class";
}
}

Polymorphism in PHP

This word is can from the Greek word poly and morphism.

Poly means “many” and morphism means property which helps us to assign more than one property.

=> Overloading Same method name with a different signature, since PHP doesn’t support method overloading concept
=> Overriding When same methods defined in parents and child class with same signature i.e know as method overriding

Example

class Animal {
public function sound() {
return "Animal sound";
}
}

class Dog extends Animal {
public function sound() {
return "Bark";
}
}

Public, Private Protected PHP

Access Modifier allows you to alter the visibility of any class member(properties and method).

In PHP 5 there are three scopes for class members.

• Public
• Protected and
• Private

Public Access modifier

Public access modifier is open to use and access inside the class definition as well as outside the class definition.

Protected access modifier

Protected is only accessible within the class in which it is defined and its parent or inherited classes.

Private access modifier

Private is only accessible within the class that defines it. ( it can’t be accessed outside the class means in inherited class).

Final keyword in PHP

The final keyword prevents child classes from overriding a method by prefixing the definition with the final. it means if we define a method with final then it prevents us to override the method.

If the class itself is being defined final then it can’t be extended.
It means when we define a class with a final then it will not allow defining its child class.

final class BaseClass {
public function test() {}
}

Abstract class

Abstraction is a way of hiding information. in abstraction, there should be at least one method
which must be declared but not defined.
The class that inherits this abstract class needs to define that method.
There must be an abstract keyword that must be returned before this class for it to be an abstract class.
this class cannot be instantiated. only the class that implements the methods of abstract class can be instantiated.
There can be more than one method that can be left undefined.

Example:

abstract class Vehicle {
abstract public function startEngine();
}

class Car extends Vehicle {
public function startEngine() {
return "Engine started";
}
}

Interface

The class that is fully abstract is called an interface.
any class that implements this interface must use the implements keyword and all the methods that are declared in the class must be defined here. otherwise, this class also needs to be defined as abstract.
multiple inheritances are possible only in the case of the interface.

it is one of Object oriented PHP concept.

Traits in PHP

Traits allow code reuse across multiple classes.

trait Logger {
public function log($msg) {
echo $msg;
}
}

class User {
use Logger;
}

Namespaces in PHP

Namespaces avoid class name conflicts.

namespace App\Models;

class User {
}

Modern OOP Features in PHP (2026)

PHP has evolved significantly. Key modern features include:

1. Typed Properties

public int $age;

2. Constructor Property Promotion

class User {
public function __construct(public string $name) {}
}

3. Readonly Properties

public readonly string $id;

4. Union Types

function test(int|string $value) {}

5. Dependency Injection (DI)

Used in frameworks for better flexibility and testing.

Real-World Example of OOP in PHP

Example: E-commerce Product System

class Product {
public function getPrice() {
return 100;
}
}

class DiscountedProduct extends Product {
public function getPrice() {
return parent::getPrice() - 20;
}
}

$product = new DiscountedProduct();
echo $product->getPrice(); // 80

OOP Best Practices (2026)

• Follow SOLID principles
• Keep classes small and focused
• Use dependency injection
• Avoid global variables
• Prefer interfaces over concrete classes
• Write reusable and testable code

Advantages of Object Oriented PHP

• Faster development
• Reusable code
• Easy debugging
• Better collaboration
• Scalable applications

Disadvantages of Object Oriented PHP

• Slightly complex for beginners
• Can increase file structure complexity
• Performance overhead (minimal in modern PHP)

Conclusion

Object Oriented PHP is a powerful approach to building scalable and maintainable applications. By mastering concepts like encapsulation, inheritance, and polymorphism, you can significantly improve your coding practices.

Object oriented PHP empowers developers to write modular, reusable, and maintainable code. By understanding the core principles of object oriented PHP, creating classes and objects, leveraging inheritance and polymorphism, implementing interfaces, and embracing design patterns, you can unlock the full potential of object oriented PHP in your projects.

With its emphasis on code organization, encapsulation, and code reuse, object oriented PHP will elevate your programming skills and enable you to build robust, scalable, and maintainable PHP applications.

Whether you’re building a small website or a large enterprise application, OOP helps you write cleaner, reusable, and future-proof code.