url friendly, redirect users to other users profile by usename

You can replace http://localhost/friendmiiDemo/profile?u=abelo3088 by http://localhost/friendmiiDemo/profile/abelo3088 by passing the username as a parameter to your method like this:

PHP Code:

<?php
class ProfileController extends CI_Controller
{
    public function profile ($username = NULL)
    {
        if ( ! empty($username))
            // Display user's profile
        else
            // Show error or redirect somewhere else...
    }
}