Static Classes in

About Static Classes

A class is a unit of code organization in PHP, often representing an instance of a thing/service/procedure. Using the static and self keywords, properties and methods may exist in reference to the class for all instances (or no instance).

<?php

class Book
{
    static $genre = 'Adventure';

    static function getGenre()
    {
        return self::$genre;
    }
}

// Usage
$genre = Book::$genre;
$genre = Book::getGenre();

Limitation

Static class methods can only call other static class properties or class methods from its own class.

<?php

class Book
{
    $name = 'Treasure Island';

    static function getName()
    {
        // This static method cannot access the instance variable
        return $this->name;
    }
}