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+```php
+<?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 Car{
+
+    private $brand;//品牌
+    private $price;//价格
+    
+    function __construct($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 = $price;
+    }
+
+   function show(){
+        echo "这辆汽车的牌子是：".$this->brand."它的价格为：".$this->price;
+   }
+
+}
+
+$a=new Car("大众","39999");
+$a->show();
+
+echo "<hr>";
+//2、在上例的基础上为汽车类定义一个子类——跑车类。为子类实例化对象并访问父类的属性。
+
+class SportsCar extends Car {
+
+    function __construct($brand, $price)
+    {
+        parent::__construct($brand, $price);
+    }
+    
+    function cool(){
+        echo "它看来非常的酷";
+    }
+
+}
+
+$b = new Sportscar("劳斯莱斯","9000000");
+echo "这辆汽车的牌子是：".$this->brand."它的价格为：".$this->price;
+$b->cool();
+echo "<hr>";
+/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 $name;
+public $age;
+public $sex;
+      function eat(){
+        echo "吃饭";
+    }
+
+    function sleep(){
+        echo "睡觉";
+    }
+
+    function skill(){//技能
+        echo "手撕鬼子";
+    }
+//受保护的
+protected $height;//身高
+protected $weight;//体重
+protected $address;//地址
+        protected function face(){
+        echo "人脸识别";
+    }
+    protected function short(){
+        echo "验证码";
+    }
+    protected function information(){
+        echo "填写身份证信息";
+    }
+
+//私有的
+private $grade;//成绩
+private $classname;//班级
+private $id;//学号
+ /**
+     * @return mixed
+     */
+    public function getGrade()
+    {
+        return $this->grade;
+    }
+
+    /**
+     * @param mixed $grade
+     */
+    public function setGrade($grade): void
+    {
+        $this->grade = $grade;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getClassname()
+    {
+        return $this->classname;
+    }
+
+    /**
+     * @param mixed $classname
+     */
+    public function setClassnamel($classname): void
+    {
+        $this->classname = $classname;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * @param mixed $id
+     */
+     public function setId($id): void
+    {
+        $this->id = $id;
+    }
+
+  private function money{
+        echo "会花钱";
+    }
+    private function book{
+        echo "会看书";
+    }
+    private function attendclass{
+        echo "会上专业课";
+    }
+
+}
+
+```
+
+
+