How to remove a static instance of a class in PHP?

Question

PHP

How to remove a static instance of a class? I create it like this

<?php

class MyClass
{
protected static $myclass;
public static function instanceClass()
  {
        if (is_null(self::$myclass)) { 
            self::$myclass= new self;  
        }
        return self::$myclass;
    }

And how to remove it, except to end the script?

Answer 1

For example, create another method with the code
self::$myclass = null;