Check method/function exist with Controller

Depending where in the application you want this to happen, you can use the _remap function from CI
https://ellislab.com/codeigniter/user-gu...llers.html

PHP Code:

public function _remap($method, $params = array())
{
    $method = 'process_'.$method;
    if (method_exists($this, $method))
    {
        return call_user_func_array(array($this, $method), $params);
    }
    show_404();
}