Loading custom classes in CodeIgniter?

To do it codeigniter way, place your custom classes in libraries folder of codeigniter. And then use it by adding that class as library in your controller like this:

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

class Someclass {

   public function some_function()
   {
   }
}

/* End of file Someclass.php */

using in controller:

$this->load->library('someclass');

checkout complete article at http://www.codeigniter.com/user_guide/general/creating_libraries.html

Libraries are easy to write but they have a few restrictions. Constructors can only take an array as a parameter and it's assumed that only one class will exist per file.

You can include any of your own classes to work with them however you want, as this is only PHP ofc :)

include APPPATH . 'classes/foo.php';
$foo = new Foo;

Or set up an __autoload() function in your config.php (best place for it to be) and you can have access to your classes without having to include them.

require_once(PHYSICAL_BASE_URL . 'system/application/controllers/abc.php');
$report= new abc();

Next use the function detail in abc contoller:

$mark=$report->detail($user);