php类作用域和trait

trait Common{
	function (){
		echo $this->name." Common Startn";
	}
}

class Car{
	function __construct(){
		echo "Car Initn";
	}
	public function drive(){
		echo "Car Dirven";
	}

	public function (){
		echo "Car startn";
	}
}

class Bus extends Car{
	use Common;

	private static $type = 'BMW';
	private $name = 'Bus';

	function __construct(){
		parent::__construct();
		echo "Bus Initn";
	}
	public function drive(){
		parent::drive();
		echo "Bus Dirven";
		$this::start();
		$this->start();
		self::start();
		
		$this::turn();
		$this->turn();
		self::turn();
		// self->turn();
	}
	// public function start(){
	// 	echo $this->name." Startn";
	// }
	private function stop(){
		echo $this->name." stopn";
	}
	private static function turn(){
		echo "Car turnn";
	}
}

$bus = new Bus();
$bus->drive();