difference between index, construct and class name functions in codeigniter class
function Upload() is a PHP4 thing. That is the constructor function for the Upload object, this is deprecated.
__construct() is the 'new' way of doing constructors
index() gets called on the index action, which is the default action
Visiting /uploads or /uploads/index will run this function. The other two functions will always run.
Hope this clears it up!
You really need to start over with a blank screen and read through the documentation on Codeigniter Controllers.
and make sure you are using CI 2.0
edited version (corrected for CI 2.0)
<?class Upload extends CI_Controller{ function __construct() { parent::__construct(); echo 'test'; } function index() { echo 'test'; }}__construct() gets called every time the controller is loaded
index() is the default function that is called if no function is given in the uri
ex. localhost/index.php/upload will actually call localhost/index.php/upload/index/