In Codeigniter How to FILTER_SANITIZE_URL before redirect to new url

When I click on my google button it sends me to the google links to verify user.

Code:

http://www.example.com/test/google?code=4/uxiEClMAV86scsrjARV-uMRgbypOu1MjT894sXgkAjc#

Once it has reached the link and user has been approved.

How can I use FILTER_SANITIZE_URL so it removes all illegal URL characters before I redirect to new page.

Currently still redirects to url http://localhost/project/# should be http://localhost/project/

PHP Code:

if ($this->input->get('code')) {

if ($this->googleplus->getAuthenticate()) {

$redirect_uri = 'http://' . $_SERVER['HTTP_HOST'] . '/project/';

$test = filter_var($redirect_uri, FILTER_SANITIZE_URL);

redirect($test);

}
} 


There's only one rule - please don't tell anyone to go and read the manual.  Sometimes the manual just SUCKS!