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<?	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();?>