About_类与对象03

php中的static：

1：属于静态变量:；

2：是全部类的属性；

3：调用静态变量要用：：（两个冒号）。

eg：1

 <html>

 <head>

     <title>static测试</title>

     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>

 </head>

 <body>

 <?PHP

 class Person{

     static $type = "人物";

     public $name = "张三";

     public $age = 18;

     public function intro(){

         echo Person::$type."<br/>".$this->name."<br/>".$this->age."<br/>";

     }

 }

 $p1 = new Person();

 $p1->intro();

 ?>

 </body>

 </html>

eg：2

 <html>

 <head>

     <title>static测试</title>

     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>

 </head>

 <body>

 <?PHP

 class Person{

     static $type = "人物";

     public $name = "张三";

     public $age = 18;

     public function intro(){

         echo Person::$type."<br/>".$this->name."<br/>".$this->age."<br/>";

     }

 }

 $p1 = new Person();

 Person::$type = "张三不是人！";

 $p1->intro();

 ?>

 </body>

 </html>

eg：3

class类的继承

 <html>

 <head>

     <title>class类的继承</title>

     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>

 </head>

 <body>

 <?PHP

 class Person{

     static $type = "人物";

     public $name = "张三";

     public $age = 18;

     public function intro_Person(){

         echo $this->name."<br/>".$this->age."<br/>";

     }

 }

 class Teacher extends Person{

     public function intro_Teacher(){

         echo $this->age;

     }

 }

 class Students extends Teacher{

     public function intro_Students(){

         echo $this->age;

     }

 }

 $p1 = new Students();

 $p1->intro_Students();

 ?>

 </body>

 </html>

巴特西

About_类与对象03

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