fungsi controller advance

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Advance extends CI_Controller {
    function index(){
        $this->load->library('advance_gw');
        $data['url']=$url=site_url("rest/belajar");

        $params=array('function'=>'test','username'=>'random',
        'password'=>'32414124');
    //  $function = 'post';
        $data['rest']= $respon = $this->advance_gw->run_api($url,$params,false  );
        if(isset($respon['error'])){
            echo '<pre>';print_r($respon);exit;
        }
        echo '<pre>';print_r($data);

    }

    function driver(){
        $core='advanceku';
        $driver='register';
        $function = 'test';

        $this->load->driver($core);

    //  $this->{$core}->{$function}();
    //  $this-> $core-> $function();
    //  $this->{$core}->{$function}($parameters);
    //  $this->{$core}->{$driver}->{$function}($row);

        $result = $this->run_driver($core, $driver, $function );
        echo '<pre>';print_r($result);echo '</pre>';
        die('<hr/>sukses');
    }

    private function run_driver($driver_core, $driver_name, $func_name, $params=array()){
        // log_add("run driver: $driver_core| $driver_name| $func_name");
        // log_add("parameter:".count($params));
/*  Kita butuh config khusus untuk daftar driver */
        $config_file='driver_gw';
        if(!is_file(APPPATH.'config/'.$config_file.".php")){
            // log_add('buatlah confignya di:'.APPPATH.'config/'.$config_file.".php",'error');
            return  'buatlah confignya di:'.APPPATH.'config/'.$config_file.".php" ;
        }

        $this->config->load($config_file);
        $valid_drivers= $this->config->item('drivers_'.$driver_core);
        if(is_null($valid_drivers)||$valid_drivers===false){
            // log_add("buatlah array confignya \$config['drivers_{$driver_core}']=array();",'error');
            return  "buatlah array confignya \$config['drivers_{$driver_core}']=array();" ;
        }

        if(!in_array($driver_name,$valid_drivers)){
            // log_add("buatlah nilai '{$driver_name}' pada array confignya \$config['drivers_{$driver_core}']=array('{$driver_name}');",'error');
            return  "buatlah nilai '{$driver_name}' pada array confignya \$config['drivers_{$driver_core}']=array('{$driver_name}');" ;
        }
/* keberadaan file driver */
        $core_file=ucfirst(strtolower($driver_core));
        $driver_file=ucfirst(strtolower($driver_core))."_".strtolower($driver_name);
        if(!is_file(APPPATH.'libraries/'.$core_file.'/drivers/'.$driver_file.".php")){
            // log_add('buatlah file drivernya di:'.APPPATH.'libraries/'.$core_file.'/drivers/'.$driver_file.".php",'error');
            return  'buatlah file drivernya di:'.APPPATH.'libraries/'.$core_file.'/drivers/'.$driver_file.".php" ;
        }

        $result=false;
        if( !method_exists($this->{$driver_core}->{$driver_name},$func_name) ){
            // log_add('buatlah fungsi '.$func_name.'($params) pada file drivernya di:'.APPPATH.'libraries/'.$core_file.'/drivers/'.$driver_file.".php",'error');
            return  'buatlah fungsi '.$func_name.'($params) pada file drivernya di:'.APPPATH.'libraries/'.$core_file.'/drivers/'.$driver_file.".php" ;
        }
        else{
            $row=$params=false;
            $params=$this->{$driver_core}->{$driver_name}->{$func_name}($row);
            return $params;
        }

        return $result;
    }

}