FirstController.PHP：

<?PHP
 class FirstController extends Controller {
  public static function returnFunc() { return 'OK'; }
}

SecondController.PHP：

<?PHP
 class SecondController extends Controller {
  public function exampleFunc() {
     $var = First::returnFunc();
  }
}

当我尝试在SecondController中执行exampleFunc()时,Yii抛出错误：

YiiBase::include(FirstController.PHP) [<a href='function.YiiBase-include'>function.YiiBase-include</a>]: Failed to open stream: No such file or directory

调用FirstController :: returnFunc()同样不起作用.

我是OOP和Yii框架的新手.有什么问题？