Static Properties Inside a Class in OOP in PHP

You can access static properties inside the class itself using self::. See the example:

Test.php<?php
  class Test
  {
    // Private static property:
    private static $property;
    
    // Static method for setting the property value:
    public static function setProperty($value)
    {
      self::$property = $value; // write data to our static property
    }
    
    // Static method for getting the property value:
    public static function getProperty()
    {
      return self::$property; // read the recorded data
    }
  }
?>

Let's use our class:

index.php<?php
  Test::setProperty('test'); // write data to the property
  echo Test::getProperty();  // output to the screen
?>

Задание 1

Create a class Num that will have two private static properties: num1 and num2. Let the property num1 store the number 2 by default, and the property num2 store the number 3.

Задание 2

Create a method getSum in the class Num, which will output the sum of the values of the properties num1 and num2 to the screen.