vars($vars[, $val = ''])

escape_str($str[, $like = FALSE])

watermark()

form_dropdown([$name = ''[, $options = array()[, $selected = array()[, $extra = '']]]])

class CI_Encrypt encode($string[, $key = ''])

hex2bin($data)

initialize([$config = array()])

add_data($filepath[, $data = NULL])

rsegment_array()

If you find that no matter what you put in your URL only your default page is loading, it might be that your server does not support the REQUEST_URI variable needed to serve