open
read
doRead: 

write
doWrite: foo|s:3:"bar";
close
Array
(
    [0] => Content-Type: text/plain; charset=utf-8
    [1] => Cache-Control: max-age=0, private, must-revalidate
    [2] => Set-Cookie: sid=random_session_id; path=/; secure; HttpOnly; SameSite=lax
)
shutdown