错误:必须将类声明为abstract或实现其余方法

Question

我有一个实现几个抽象方法的类.当我扩展该类时,我收到以下致命错误消息:

Class CI_Controller_Rest contains 6 abstract methods and must therefore be declared abstract or implement the remaining methods  

具有抽象方法的类:

class CI_Controller_Rest extends CI_Controller {
    public function __construct() {
        parent::__construct();
    }

    abstract public function index();

    abstract public function get();

    abstract public function head();

    abstract public function post();

    abstract public function put();

    abstract public function delete();
}  

我扩展的类CI_Controller_Rest:

class Welcome extends CI_Controller_Rest {

    public function __construct() 
    {
        parent::__construct();
    }

    public function index() {}

    public function get() {}

    public function head() {}

    public function post() {}

    public function put() {}

    public function delete() {}
}  

我该怎么办呢？

Answer 1

如果一个类有一个或多个抽象函数,它必须声明为抽象类:

abstract class CI_Controller_Rest extends CI_Controller {

    public function __construct() {
        parent::__construct();
    }

    abstract public function index();

    abstract public function get();

    abstract public function head();

    abstract public function post();

    abstract public function put();

    abstract public function delete();
}