<?
	class some_class {
	
		protected $somevar;
		
		function echo_var() {
		
			echo $this->somevar . "\n";
		}
	}
	
	class some_subclass extends some_class {
	
		public $somereference;
	
		function __construct() {
		
			$this->somevar = 'poop';
			$this->somereference = &$this->somevar;
		}
	}
	
	$testobj = new some_subclass();
	$testobj->echo_var();
	$testobj->somereference = 'modified!';
	echo $testobj->somereference . "\n";
	$testobj->echo_var();
?>