first_row([$type = 'object'])

dbutil([$db = NULL[, $return = FALSE]])

escape($str)

Please read the upgrade notes corresponding to the version you are upgrading from. Upgrading from 3.0.6 to 3.1.0

now([$timezone = NULL])

valid_ip($ip[, $which = ''])

site_url()

add_row([$args = array()[, ...]])

read_dir($path[, $preserve_filepath = TRUE[, $root_path = NULL]])

class CI_Cart $product_id_rules = '.a-z0-9_-' These are the regular expression