Static Properties in OOP in PHP

In addition to static methods, you can also create static properties. Such properties are also declared using the keyword static:

Test.php<?php
  class Test
  {
    public static $property;
  }
?>

You can write something to a static property and read from it. The property name is specified with the dollar sign:

index.php<?php
  Test::$property = 'test';
  echo Test::$property; // outputs 'test'
?>

Задание 1

Create a Num class that will have two public static properties: num1 and num2. Write the number 2 to the first property, and the number 3 to the second one. Display the sum of the property values on the screen.