php设计模式的六大原则（六）：迪米特法则

<?phpclass teacher {	//老师对学生发布命令,清一下女生	public function commond(groupleader $groupleader){		//初始化女生		for($i=0; $i<20; $i++){			$listgirls[] = new girl();		}		//告诉体育委员开始执行清查任务		$groupleader -> countgirls($listgirls);	}}class groupleader {	//有清查女生的工作	public function countgirls($listgirls = array()){		echo '女生的数量是:' . sizeof($listgirls);	}}class girl {}class client {	public static function doing() {		$teacher= new teacher();		//老师发布命令		$teacher -> commond(new groupleader());	}}client :: doing();class teacher {	public function commond(groupleader $groupleader){		//告诉体育委员开始执行清查任务		$groupleader -> countgirls();	}}class groupleader {	private $_listgirls = array();	//传递全班的女生	public function __construct($listgirls){		$this -> _listgirls = $listgirls;	}	//有清查女生的工作	public function countgirls(){		echo "女生数量是：" . sizeof($this -> _listgirls);	}	}class girl {}class client {	public static function doing() {			//初始化女生		for($i=0; $i<20; $i++){			$listgirls[] = new girl();		}			$teacher= new teacher();		//老师发布命令		$teacher -> commond(new groupleader($listgirls));	}}client :: doing();