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<?php

class Myaction_Controller extends Action_Controller
{
    public function action_index()
    {
        //This method is required and should forward the the default (sub)action.
    }
}

<?php

class Myaction_Controller extends Action_Controller
{
    public function action_index()
    {
        //This method is required and should forward the the default (sub)action.
        $this->action_something();
    }

    public function action_something()
    {
        //This takes care of the sub action "something"
    }
}

<?php

/**
 * @package External Authentication
 *
 * @author Antony Derham
 * @copyright 2014 Antony Derham
 *
 * @version 1.0
 */

if (!defined('ELK'))
	die('No access...');

/**
 * ExtAuth_Controller class, deals with authenticating external accounts
 */
class ExtAuth_Controller extends Action_Controller
{
	/**
	 * Entry point in ExtAuth controller
	 */
	public function action_index()
	{
		// Only action, try and authenticate
		$this->action_extlogin();
	}

	/**
	 * Attempt to authenticate them with HybridAuth
	 *
	 * What it does:
	 *  - takes the provider ID from GET var and attempts HybridAuth login.
	 */
	public function action_extlogin()
	{
		// Include the HybridAuth external libaray and configuration
   		$config = EXTDIR . '/hybridauth/config.php';
    		require_once(EXTDIR . '/hybridauth/Hybrid/Auth.php');