Example of Object-Oriented Programming (OOP) in PHP

A guide with a basic example of Object-Oriented Programming (OOP) in PHP, explaining how to use classes and objects to structure code using OOP principles.

<?php
// Define class "Person"
class Person {
    // Class attributes
    private $name;
    private $age;

    // Constructor to initialize object with initial values
    public function __construct($name, $age) {
        $this->name = $name;
        $this->age = $age;
    }

    // Method to get the person's name
    public function getName() {
        return $this->name;
    }

    // Method to get the person's age
    public function getAge() {
        return $this->age;
    }

    // Method to display person's information
    public function displayInfo() {
        echo "Name: " . $this->getName() . "<br>";
        echo "Age: " . $this->getAge() . "<br>";
    }
}

// Create object from class "Person"
$person1 = new Person("John Doe", 25);

// Call method to display object's information
$person1->displayInfo();
?>

Detailed explanation:

1. Defining the Person class:

   • A class is a blueprint for creating objects. In this example, the Person class contains attributes like name and age to store information about a person.

2. Constructor __construct():

   • A constructor is a special method called when an object of the class is created. It helps initialize the object's attributes with default values.

3. Methods getName(), getAge(), and displayInfo():

   • getName() and getAge() are methods used to retrieve the values of the name and age attributes from an object.
   • displayInfo() is a method used to display the person's information on the webpage, using the output from getName() and getAge().

4. Creating an object:

   • The object person1 is created from the Person class with the name "John Doe" and age 25. The displayInfo() method is then called to display the object's information.

PHP Version:

This code is compatible with PHP 5.0 and above.