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0503课后作业
张成钢的博客
Original
666 people have browsed it

job0503.png

实例

<?php 
	class car {
		//属性
		private $brand;
		private $type;
		private $color;
		private $size=[];

		//构造方法
		public function __construct($brand='',$type='',$color='',array $size=[]) 
		{
			$this->brand = $brand;
			$this->type = $type;
			$this->color = $color;
			$this->size = $size;
		}

		//__get魔术方法 查询器
		public function __get($property_name)
		{
			$msg = null;
			if (isset($this->$property_name)){
				$msg = $this->$property_name;
			}
			else {
				$msg = '属性'.$property_name.'不存在!';
			}
			return $msg;
		}


		//设置器
		public function __set($property_name,$value)
		{
			$this->$property_name = $value;
		}

		//方法
		public function starting()
		{
			return '汽车启动!';
		}

		public function drive()
		{
			return '汽车驾驶!';
		}
	}

 ?>

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实例

<?php 

	/**
	* 
	*/
	class car_bm extends car
	{
		private $ccs = true;
		private $gps = true;

		function __construct($brand='',$type='',$color='',array $size=[],$ccs,$gps)
		{
			// parent::__construct($brand='',$type='',$color='',array $size=[]);

        	parent::__construct($brand,$type,$color,$size);		
			// 属性扩展
			$this->$ccs = $ccs;
			$this->gps = $gps;
		}

		public function starting()
		{
			return '远程遥控启动!';
		}

		public function drive()
		{
			return parent::drive().'还支持无人驾驶!';
		}
	}

 ?>

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实例

<?php 

	//类自动加载
	spl_autoload_register(function($className){
	    require './class/'.$className.'.php'; 
	});


	$bm_car = new car_bm('宝马','X5','白色',[4909,1938,1772],true,true);

	echo '品牌:'.$bm_car->brand.'<br>';
	echo '型号:'.$bm_car->type.'<br>';
	echo '颜色:'.$bm_car->color.'<br>';
	echo '尺寸: '. print_r($bm_car->size,true). '<br>';
	//子类扩展属性
	echo '定速巡航:'.($bm_car->ccs?'支持':'无'). '<br>';
	echo 'GPS导航:'.($bm_car->gps?'支持':'无'). '<br>';

	//子类扩展方法
	echo '<hr>';
	echo $bm_car->starting(). '<br>';
	echo $bm_car->drive(). '<br>';


 ?>

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