creating a core class that extends another core class codeigniter [duplicate]

问题

class Settings extends USER_Controller {...}

class USER_Controller extends MY_Controller {...}//limit access to user and define some params and functions that is user depended

class MY_Controller extends CI_Controller {...}//provide extra functionality accross all controllers

well if i try to create above 3 class's this will not work.

yet if i just use settings extends MY_Controller it will work fine.

so is there a way i can put a middle class between my controller and MY_Controller -the base controller that extends CI_Controller ?

回答1:

As @Minhaz Ahmed said, the problem is loading the class. Codeigniter only loads the class with the subclass prefix as in,

https://github.com/EllisLab/CodeIgniter/blob/develop/system/core/CodeIgniter.php#L276

if (file_exists(APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php'))
{
    require APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php';
}

So after some diggings I have came with a solution using both codeigniter hooks and spl_autoload_register() for my project without hacking the CORE. Please follow the steps to achieve what's in THE QUESTION.

Enable hooks in the config file if it isn't already.
create a hook in application/config/hooks.php as below.

$hook['pre_system'] = array( 'class' => '', 'function' => 'autoload', 'filename' => 'autoload.php', 'filepath' => 'hooks', 'params' => '' );
Create the autoload.php in application/hooks folder.
inside the autoload.php file,

function autoload() { spl_autoload_register(function($class) { if(strpos($class,'CI_') !== 0 && file_exists(APPPATH.'core/'.$class.EXT)) { require_once APPPATH . 'core/' . $class . EXT; } }); }

That's it.

Note: Here, I've used pre_system hook, not pre_controller, since codeigniter loads the base controller classes between pre_system and pre_controller hooks.

Hope this helps. If there are any issues with this please do comments.

回答2:

Place the user_controller class file at the end of MY_Controller.php

MY_Controller.php in /application/core/

class MY_Controller extends CI_Controller {...}
class USER_Controller extends MY_Controller {...}

Now from your controller in your controllers folder, you can extend the controller from USER_Controller:

 class Settings extends USER_Controller {...}

回答3:

What did the best job for CI 2.1.4:
application/core

create for example:
- base_controller (base instructions, extending from ci_controller)
- admin_controller (extending from basecontroller and adds authentication instructions)

Then use them in: application/controllers:
for example:
class users extends admin_controller...

回答4:

You could use Phil's core solution, its simple and easy.

http://philsturgeon.co.uk/blog/2010/02/CodeIgniter-Base-Classes-Keeping-it-DRY

回答5:

You can extend the class the way you want but the problem is loading the class, you have to include your USER_Controller your Settings Class. Problem is not extend problem is including the file, so you have to find a way to include the second class.

See http://www.php.net/manual/en/function.spl-autoload.php

来源：https://stackoverflow.com/questions/21663045/creating-a-core-class-that-extends-another-core-class-codeigniter

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