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+```php+HTML
+<?php
+
+//1、写一段代码，定义一个汽车类，有品牌与价格两种属性。并为类实例化对象，为对象的属性赋值并引用。
+class Vehicle{
+
+    private $brand;
+    private $price;
+    
+    function __construct($brand,$price){
+        $this->brand=$brand;
+        $this->price=$price;
+    
+    }
+    
+    /**
+     * @return mixed
+     */
+    public function getBrand()
+    {
+        return $this->brand;
+    }
+    
+    /**
+     * @param mixed $brand
+     */
+    public function setBrand($brand)
+    {
+        $this->brand = $brand;
+    }
+    
+    /**
+     * @return mixed
+     */
+    public function getPrice()
+    {
+        return $this->price;
+    }
+    
+    /**
+     * @param mixed $price
+     */
+    public function setPrice($price)
+    {
+        $this->price = $price;
+    }
+
+   function show(){
+        echo "一辆".$this->brand."价格为".$this->price;
+   }
+
+}
+
+$a=new Vehicle("奔驰","50万");
+$a->show();
+
+echo "\n";
+
+
+//2、在上例的基础上为汽车类定义一个子类——跑车类。为子类实例化对象并访问父类的属性。
+
+class Sportscar extends Vehicle {
+
+    function __construct($brand, $price)
+    {
+        parent::__construct($brand, $price);
+    }
+    
+    function Speed(){
+        echo "速度很快";
+    }
+
+
+
+}
+
+$a = new Sportscar("法拉利","200万");
+$a->show();
+$a->Speed();
+
+
+//3、定义一个类，分别定义3个公共的属性和方法，3个受保护的属性和方法，3个私有属性和方法。
+class  A{
+
+//公共的
+public $a;
+public $b;
+public $c;
+//受保护的
+protected $d;
+protected $e;
+protected $f;
+
+//私有的
+private $h;
+private $g;
+private $k;
+
+public function a(){}
+public function b(){}
+public function c(){}
+
+protected function d(){}
+protected function e(){}
+protected function f(){}
+
+private function h(){}
+private function g(){}
+private function k(){}
+
+
+
+
+
+
+}
+
+
+```
+