Combination with static in OOP in PHP

A class can contain both static properties and methods, and regular ones.

Let's look at an example. Suppose we have a class Test with both a static property and a regular one:

Test.php<?php
  class Test
  {
    public static $staticProperty = 'static';
    public $usualProperty = 'usual';
  }
?>

Let's work with the regular property of the class:

index.php<?php
  $test = new Test;
  echo $test->usualProperty;
?>

And now let's use the static property:

index.php<?php
  echo Test::$staticProperty;
?>