watermark()

version()

set_error($msg)

read_file($file)

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

delete([$table = ''[, $where = ''[, $limit = NULL[, $reset_data = TRUE]]]])

add_key($key[, $primary = FALSE])

last_row([$type = 'object'])

is_really_writable($file)

request($incoming)