hash_equals($known_string, $user_string)

total_segments()

humanize($str[, $separator = '_'])

class CI_Output $parse_exec_vars = TRUE; Enables/disables parsing of the

set_header($header[, $replace = TRUE])

prep_url($str = '')

class CI_Xmlrpc initialize([$config = array()])

__set($key, $value)

accept_lang([$lang = 'en'])

form_upload([$data = ''[, $value = ''[, $extra = '']]])