sess_destroy()
set_userdata($data[, $value = NULL])
unmark_flash($key)
class CI_Session userdata([$key = NULL])
mark_as_temp($key[, $ttl = 300])
set_flashdata($data[, $value = NULL])
keep_flashdata($key)
userdata([$key = NULL])
sess_regenerate([$destroy = FALSE])
get_temp_keys()
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