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@@ -0,0 +1,147 @@
+# 解答
+
+``` php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/17
+ * Time: 16:07
+ */
+//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 = $price;
+    }
+
+}
+$cars=new car("车名："."法拉利 ","车的价格："."500万元");
+echo $cars->getBrand().$cars->getPrice();
+
+//echo $a;
+//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 bus extends car{
+      private $color;//颜色
+      private $speed;// 速度
+
+     function __construct($brand, $price,$color,$speed)
+     {
+         $this->color = $color;
+         $this->speed = $speed;
+         parent::__construct($brand, $price);
+     }
+
+    /**
+     * @return mixed
+     */
+    public function getColor()
+    {
+        return $this->color;
+    }
+
+    /**
+     * @param mixed $color
+     */
+    public function setColor($color)
+    {
+        $this->color = $color;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getSpeed()
+    {
+        return $this->speed;
+    }
+
+    /**
+     * @param mixed $speed
+     */
+    public function setSpeed($speed)
+    {
+        $this->speed = $speed;
+    }
+}
+
+echo "<br><hr>";
+$buses=new bus("车名：".'劳斯莱斯 ',"车的价格："." ".'1千万元 ',"车的颜色："." ".'蓝色 ',"车的速度："." ".'1000米每秒');
+
+echo $buses->getBrand().$buses->getPrice().$buses->getColor().$buses->getSpeed();
+
+
+//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 Qu
+{    public $eat;
+     public $fiy;
+     public $day;
+     public function ii(){//公共
+
+     }
+    public function rt(){
+
+    }
+    public function tw(){
+
+    }
+     protected $ing;
+     protected $zng;
+     protected $ong;
+    protected function aa(){//保护
+
+    }
+    protected function qw(){
+
+    }
+    protected function zx(){
+
+    }
+     private $name;
+     private $age;
+     private $breed;
+   private function s(){ // 私有
+
+   }
+    private function cv(){
+
+    }
+    private function op(){
+
+    }
+}
+```
+