CodeIgniter with php5 - CI-generated 404 Error

Code:

function _get_uri_string()

    {

        if (strtoupper($this->config->item('uri_protocol')) == 'AUTO')

        {



            // If the URL has a question mark then it's simplest to just

            // build the URI string from the zero index of the $_GET array.

            // This avoids having to deal with $_SERVER variables, which

            // can be unreliable in some environments

            if (is_array($_GET) AND count($_GET) == 1)

            {

                // Note: Due to a bug in current() that affects some versions

                // of PHP we can not pass function call directly into it

                $keys = array_keys($_GET);

                return current($keys);

            }

        

            // Is there a PATH_INFO variable?

            // Note: some servers seem to have trouble with getenv() so we'll test it two ways        

            $path = (isset($_SERVER['PATH_INFO'])) ? $_SERVER['PATH_INFO'] : @getenv('PATH_INFO');        

            if ($path != '' AND $path != "/".SELF)

            {

                return $path;

            }

                    

            // No PATH_INFO?... What about QUERY_STRING?

            $path =  (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : @getenv('QUERY_STRING');    

            if ($path != '')

            {

                return $path;

            }

            

            // No QUERY_STRING?... Maybe the ORIG_PATH_INFO variable exists?

            $path = (isset($_SERVER['ORIG_PATH_INFO'])) ? $_SERVER['ORIG_PATH_INFO'] : @getenv('ORIG_PATH_INFO');      

            if ($path != '' AND $path != "/".SELF)

            {

                return $path;

            }



            // We've exhausted all our options...

            return '';

        }

Code:

/*

|--------------------------------------------------------------------------

| URI PROTOCOL

|--------------------------------------------------------------------------

|

| This item determines which server global should be used to retrieve the

| URI string.  The default setting of "AUTO" works for most servers.

| If your links do not seem to work, try one of the other delicious flavors:

|

| 'AUTO'            Default - auto detects

| 'PATH_INFO'        Uses the PATH_INFO

| 'QUERY_STRING'    Uses the QUERY_STRING

| 'REQUEST_URI'        Uses the REQUEST_URI

| 'ORIG_PATH_INFO'    Uses the ORIG_PATH_INFO

|

*/

$config['uri_protocol']    = "AUTO";