Codeigniter: Remap params to index() function

controller.php

<?

function _remap($method)
{
    $param_offset = 2;

    // Default to index
    if ( ! method_exists($this, $method))
    {
        // We need one more param
        $param_offset = 1;
        $method = 'index';
    }

    // Since all we get is $method, load up everything else in the URI
    $params = array_slice($this->uri->rsegment_array(), $param_offset);

    // Call the determined method with all params
    call_user_func_array(array($this, $method), $params);
}