sanitize_filename($filename)

octal_permissions($perms)

plural($str)

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

library($library[, $params = NULL[, $object_name = NULL]])

product_options([$row_id = ''])

send([$auto_clear = TRUE])

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

set_error($msg)

quoted_printable_encode($str)