<?php

class A {
	private $test_var;
	
	function __construct () {
		$this->test_var = "set in class A";
	}
	
	function dumpTestVar () {
		var_dump ($this->test_var);
	}
}

class B extends A {
	private $test_var;
	
	function __construct () {
		$this->test_var = "set in class B";
	}
}

$ClassB = new B ();

$ClassB->dumpTestVar ();

?>