How can I get CodeIgniter 2.1.4 to load my extende

I have looked for this answer all through stackoverflow and none have been able to help me.

my file name is: application/core/MY_Controller.php

class MY_Controller extends CI_Controller {

/**
 * Constructor
 */
public function __construct()
{
        parent::__construct();

}

}

I made a post in this thread asking if anyone had found an answer. I tried everything in that thread, and in all suggested links.

I'm at a complete loss.

Everything works on my local WAMP server (apache 2.4 php 5.4) and not on the production server (Ubuntu 12.04, apache 2.4, php 5.5)

error:

PHP Fatal error: Class 'MY_Controller' not found in filepath/application/controllers/welcome.php on line 7.

Line 7 is where I define the class: class welcome extends MY_Controller {

EDIT Thanks for all the help. I figured out what was wrong. When I initially started trying to figure out this problem, I noticed that I did not have my case right on the name of MY_Controller.php, it was My_Controller.php.

So, what I found out was that even though I changed the name of the file on my local machine, when I uploaded it, the name still didn't change. So, when I went to change it to all lower case I decided to do that directly on the production server and found that after all this time it was still named with the lowercase y when I thought I had changed that. I hope this helps anyone else who migrates from a WAMP environment to a LAMP environment to know that even though the case is changed, it is still the same name, and may or may not be changed when you upload it.

please go to your application/config/config.php and on the bottom insert this code

function __autoload($class)
{
 if(strpos($class, 'CI_') !== 0)
 {
  @include_once( APPPATH . 'core/'. $class . EXT );
 }
}

Now you are good to go.

please try creating file MY_Controller.php in /core folder with this body

class MY_Controller extends CI_Controller {

    public function __construct() {
        parent::__construct();
        $this->output->enable_profiler(TRUE);
    }

}

and use welcome controller if it works.

I missed note: Everything works on my local WAMP server (apache 2.4 php 5.4) and not on the production server (Ubuntu 12.04, apache 2.4, php 5.5)

Please check your case of files/controllers

Please try editing/renaming everything in to lower case (even my_controller extends CI_Controller).