mark_as_flash($key)

flashdata([$key = NULL])

unmark_temp($key)

tempdata([$key = NULL])

__set($key, $value)

__get($key)

set_tempdata($data[, $value = NULL])

unset_userdata($key)

class CI_Session userdata([$key = NULL])

set_userdata($data[, $value = NULL])