<?PHP

  class Student{

    public static $fee;

    public $name;

    //构造函数

    function __construct($name)

    {

       $this->name=$name;

    }

    //入学,静态方法无法操作非静态变量，因为静态方法（变量）是属于类，而非静态的成员变量时属于对象的

   static    function  enterSchool($ifee)

    {

      self::$fee+=$ifee;

    }

  }

  $student1=new Student("张三");

   Student::enterSchool(100);

  //$student1->enterSchool(100);

  $student2=new Student("李四");

  Student::enterSchool(100);

  echo "<br/>总学费".Student::$fee;

?>