codeigniter中这些行的含义是什么?

Puz*_*Boy 0 php codeigniter

class Demo extends CI_Controller
{
  function __construct()
  {
    parent::__construct();
  }
}
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Sat*_*tya 5

Demo类的构造函数正在调用其父类的构造函数,在本例中是CI_Controller