Trusted answers to developer questions
Trusted Answers to Developer Questions

Related Tags

php
communitycreator

How to make a class in PHP

Dario Vincenzo Tarantini

From version 5, PHP introduced object oriented programming, otherwise known as OOP. Because of OOP, today we can say that PHP is a fully-featured language capable of building a lot of applications.

In this shot, by mentions of OOP, we are referring to the use of classes. A class is a piece of code that identifies an abstract concept.

Inside a class, we have:

  • Variables, which are called properties.
  • Functions, which are called methods.

Let’s look at a visual representation of a class.

%0 node_1 class node_2 methods node_1->node_2 node_3 properties node_1->node_3 node_1634059035571 doSomething() node_2->node_1634059035571 node_1634059058845 doSomethingElse() node_2->node_1634059058845 node_1634059129478 $propriety node_3->node_1634059129478

Example

We can define a class with the keyword class. After writing the name of the class, we can define our methods and properties. Both can have visibility: public, private, and protected. A class needs to be initialized with the new keyword.

Let’s look at an example.

<?php 

class MyHello {
  private $sampleHello;
  public function __construct(){
    $this->sampleHello = "Hello, educative!";
  }
  public function sayHello(){
    echo $this->sampleHello;
  }
}

$instance = new MyHello(); // inizialize a class
$instance->sayHello(); // call a method

Explanation

In the code above, we have constructed a class named MyHello. The class has one private property called $sampleHello and two public properties called the __construct() (the constructor of the class) and sayHello().

In line 13, a new instance of the class is created using the new keyword. Then in line 14, the sayHello() method is invoked of the previously created instance.

RELATED TAGS

php
communitycreator

CONTRIBUTOR

Dario Vincenzo Tarantini
RELATED COURSES

View all Courses

Keep Exploring