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+```php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/17
+ * Time: 16:10
+ */
+//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{//汽车
+    var $brand;
+    var $price;
+    function __construct($brand,$price){
+        $this->brand=$brand;
+        $this->price=$price;
+    }
+}
+$a =new car("丰田","15万");
+echo "这辆车的品牌为：".$a->brand."，价格为：".$a->price;
+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 roadster extends car{//跑车
+    var $speed;
+    function __construct($brand,$price,$speed){
+        $this->brand=$brand;
+        $this->price=$price;
+        $this->speed=$speed;
+    }
+
+}
+$b =new roadster("法拉利","100万","快");
+echo "这辆车的品牌为：".$b->brand."，价格为：".$b->price."，速度".$b->speed;
+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 cat{
+    public $name;//名字
+    public $brand;//品种
+    public $color;//颜色
+    public function eat(){
+        echo "会吃饭";
+    }
+    public function sleep(){
+        echo "会睡觉";
+    }
+    public  function run(){
+        echo "会跑";
+    }
+    protected $age;//年龄
+    protected $feeling;//感情状况
+    protected $character;
+
+    /**
+     * @return mixed
+     */
+    public function getWeight()
+    {
+        return $this->weight;
+    }
+
+    /**
+     * @param mixed $weight
+     */
+    public function setWeight($weight): void
+    {
+        $this->weight = $weight;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getTall()
+    {
+        return $this->tall;
+    }
+
+    /**
+     * @param mixed $tall
+     */
+    public function setTall($tall): void
+    {
+        $this->tall = $tall;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getSex()
+    {
+        return $this->sex;
+    }
+
+    /**
+     * @param mixed $sex
+     */
+    public function setSex($sex): void
+    {
+        $this->sex = $sex;
+    }//性格
+    protected function like(){
+        echo "喜欢玩毛线球";
+    }
+    protected function call(){
+        echo "会喵喵喵";
+    }
+    protected function dump(){
+        echo "会蹦蹦跳跳";
+    }
+    private $weight;
+    private $tall;
+    private $sex;
+    private function climb{
+        echo "会爬树";
+    }
+    private function bite{
+        echo "会咬人";
+    }
+    private function heat{
+        echo "会发情";
+    }
+}