how to get class name in controller folder on codeignither framework?

This solution to get the class name from controller folder using codeigniter framework.

/**
* CodeIgniter

* NOTE: If you change these, also change the error_reporting() code below
*/
    // define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'development');
/*
*---------------------------------------------------------------
* ERROR REPORTING
*---------------------------------------------------------------
*
* Different environments will require different levels of error reporting.
* By default development will show errors but testing and live will hide them.
*/
switch (ENVIRONMENT)
{
    case 'development':
        error_reporting(-1);
        ini_set('display_errors', 1);
    break;
    case 'testing':
    case 'production':
        ini_set('display_errors', 0);
        error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED & ~E_STRICT & ~E_USER_NOTICE & ~E_USER_DEPRECATED);
    break;
    default:
        header('HTTP/1.1 503 Service Unavailable.', TRUE, 503);
        echo 'The application environment is not set correctly.';
        exit(1); // EXIT_ERROR
}
/*
*---------------------------------------------------------------
* SYSTEM DIRECTORY NAME
*---------------------------------------------------------------
*
* This variable must contain the name of your "system" directory.
* Set the path if it is not in the same directory as this file.
*/
    $system_path = 'system';
/*
*---------------------------------------------------------------
* APPLICATION DIRECTORY NAME
*---------------------------------------------------------------
*
* If you want this front controller to use a different "application"
* directory than the default one you can set its name here. The directory
* can also be renamed or relocated anywhere on your server. If you do,
* use an absolute (full) server path.
* For more info please see the user guide:
*
* https://codeigniter.com/user_guide/general/managing_apps.html
*
* NO TRAILING SLASH!
*/
    $application_folder = 'application';
/*
*---------------------------------------------------------------
* VIEW DIRECTORY NAME
*---------------------------------------------------------------

* NO TRAILING SLASH!
*/
    $view_folder = '';

    // Set the current directory correctly for CLI requests
    if (defined('STDIN'))
    {
        chdir(dirname(__FILE__));
    }
    if (($_temp = realpath($system_path)) !== FALSE)
    {
        $system_path = $_temp.DIRECTORY_SEPARATOR;
    }
    else
    {
        // Ensure there's a trailing slash
        $system_path = strtr(
            rtrim($system_path, '/\\'),
            '/\\',
            DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
        ).DIRECTORY_SEPARATOR;
    }
    // Is the system path correct?
    if ( ! is_dir($system_path))
    {
        header('HTTP/1.1 503 Service Unavailable.', TRUE, 503);
        echo 'Your system folder path does not appear to be set correctly. Please open the following file and correct this: '.pathinfo(__FILE__, PATHINFO_BASENAME);
        exit(3); // EXIT_CONFIG
    }
/*
* -------------------------------------------------------------------
* Now that we know the path, set the main path constants
* -------------------------------------------------------------------
*/
    // The name of THIS file
    // define('SELF', pathinfo(__FILE__, PATHINFO_BASENAME));
    // Path to the system directory
    // define('BASEPATH', $system_path);
    // Path to the front controller (this file) directory
    // define('FCPATH', dirname(__FILE__).DIRECTORY_SEPARATOR);
    // Name of the "system" directory
    // define('SYSDIR', basename(BASEPATH));
    // The path to the "application" directory
    if (is_dir($application_folder))
    {
        if (($_temp = realpath($application_folder)) !== FALSE)
        {
            $application_folder = $_temp;
        }
        else
        {
            $application_folder = strtr(
                rtrim($application_folder, '/\\'),
                '/\\',
                DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
            );
        }
    }
    elseif (is_dir(BASEPATH.$application_folder.DIRECTORY_SEPARATOR))
    {
        $application_folder = BASEPATH.strtr(
            trim($application_folder, '/\\'),
            '/\\',
            DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
        );
    }
    else
    {
        header('HTTP/1.1 503 Service Unavailable.', TRUE, 503);
        echo 'Your application folder path does not appear to be set correctly. Please open the following file and correct this: '.SELF;
        exit(3); // EXIT_CONFIG
    }
    // define('APPPATH', $application_folder.DIRECTORY_SEPARATOR);
    // The path to the "views" directory
    if ( ! isset($view_folder[0]) && is_dir(APPPATH.'views'.DIRECTORY_SEPARATOR))
    {
        $view_folder = APPPATH.'controllers';

        // $router =& load_class('Router', 'core');
        // $controller_names = $router->fetch_class();
        // $method_name = $router->fetch_method();
        //echo $controller_names;
        $files1 = scandir($view_folder);
        $files2 = scandir($view_folder, 1);
        $scanned_directory = array_diff(scandir($view_folder,1), array('..', '.'));
        // echo "<pre>";print_r($scanned_directory);exit;
    }
    elseif (is_dir($view_folder))
    {
        if (($_temp = realpath($view_folder)) !== FALSE)
        {
            $view_folder = $_temp;
        }
        else
        {
            $view_folder = strtr(
                rtrim($view_folder, '/\\'),
                '/\\',
                DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
            );
        }
    }
    elseif (is_dir(APPPATH.$view_folder.DIRECTORY_SEPARATOR))
    {
        $view_folder = APPPATH.strtr(
            trim($view_folder, '/\\'),
            '/\\',
            DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
        );
    }
    else
    {
        header('HTTP/1.1 503 Service Unavailable.', TRUE, 503);
        echo 'Your view folder path does not appear to be set correctly. Please open the following file and correct this: '.SELF;
        exit(3); // EXIT_CONFIG
    }
    // define('VIEWPATH', $view_folder.DIRECTORY_SEPARATOR);
/*
* --------------------------------------------------------------------
* LOAD THE BOOTSTRAP FILE
* --------------------------------------------------------------------
*
* And away we go...
*/
require_once BASEPATH.'core/CodeIgniter.php';