Extended Core class of CI advanced usage

In the previous article CI advanced usage to create your own class library, do you think that each controller's construction method to execute the checksum code actually violates the programming specification of the dry (do ' NT repeat yourself) principle?

In fact, we can completely put the code of the checksum in the constructor of the parent class. The parent class of the controller in CI is Ci_controller, now let's extend the parent class.

Create a class file in the Application/core directory, my_controller.php, with the following contents:

<?phpclass My_controller extends Ci_controller{public function __construct () {parent::__construct (); $this Load->library (' auth '); $this->auth->checkpower ();}}

After modifying the welcome controller to the following version, let it inherit the My_controller:

<?phpdefined (' BasePath ') or exit (' No Direct script access allowed '); class Welcome extends My_controller {/** * Index Pa GE for this controller. * Maps to the following URL * http://example.com/index.php/welcome *-OR-* http://example.com/index.php/welcome/index *-OR-* Since This controller is set as the default controller in * config/routes.php, it's displayed at Http://example. com/* * So no other public methods not prefixed with an underscore would * map to/index.php/welcome/<method_name> * @see http://codeigniter.com/user_guide/general/urls.html */public function __construct () {parent::__construct ();} Public Function Index () {$this->load->view (' Welcome_message ');}}

Visit http://localhost/ci2/again, the result is the same error message:

Illegal access

Attention:

① extended classes must be declared to be extended by the parent class.

② the file where the newly extended class resides must be prefixed with my_ (this option is configurable, as described below).

If you do not like my as the class prefix, you can find this item in the application/config/config.php file modified to be a prefix name other than ci_ :

$config [' subclass_prefix '] = ' my_ ';

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Extended Core class of CI advanced usage