get_content_type()

convert_xml($str)

unset_userdata($key)

query($sql[, $binds = FALSE[, $return_object = NULL]])

list_files([$path = '.'])

octal_permissions($perms)

increment($id[, $offset = 1])

$this->db->call_function(); This function enables you to call PHP database functions that are not natively included in CodeIgniter,

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

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