public function getLengthOfService(){
return $this->lengthOfService;
}
}
// 继承自 User 类,同时实现了 TeacherInterface 接口.
class GraduateStudent extends User implements TeacherInterface {
private $teacher ;
public function __construct(){
$this->teacher = new Teacher();
}
public function getLengthOfService(){
return $this->teacher->getLengthOfService();
}
}
class Act{
//注意,类型提示改成了接口类型
public static function getUserName(UserInterface $_user){
echo "Name is " . $_user->getName() ."<br>";
}
//类型提示改成了 TeacherInterface 类型.
public static function getLengthOfService(TeacherInterface $_teacher){
echo "Age is " .$_teacher->getLengthOfService() ."<br>";
}
}
$graduateStudent = new GraduateStudent();
Act::getUserName($graduateStudent);
Act::getLengthOfService($graduateStudent);
//实现多重身份的一个对象.
?>