PHP类与对象

//创建一个类class Student{   //定义成员属性用public声明,public指的是共用的，任何地方都能访问   //姓名   public $name = ‘lemon‘;//设置初始值   //学号   public $no;   //成绩   public $score;

   //成员方法   public function sing($songName){      echo "学生会唱{$songName}歌";   }

   public function run(){      echo "学生去跑步了";   }

   public function showSelf(){      echo "我叫".$this->name.",我的学号是{$this->no},我的成绩是{$this->score}";      $this->sing("成都");   }}

class Teacher{   public $name;   public $no;   public $course;

   public function teachBook(){      echo "老师会教书";   }

   public function dance(){      echo "老师会跳舞";   }}

//实例化对象$student1 = new Student();echo $student1->name;$student1->name = ‘柠檬‘;echo $student1->name;$student1->sing("国");echo"<hr>";$student2 = new Student();$student2->name = "张三";$student2->no = "1001";$student2->score = "100";$student2->showSelf();

include "";//用来引用class类,出现错误会警告require "";//用来引用class类，出现错误会崩溃include_once "";//只引用一次，多次引用不会报错require_once "";//只引用一次，多次引用不会报错