session id :
Warning: Undefined array key "sess_id" in /users/2019/i1919032/public_html/2022/WebProg/ch10/test10-04.php on line 10

session pw :
Warning: Undefined array key "sess_pw" in /users/2019/i1919032/public_html/2022/WebProg/ch10/test10-04.php on line 11

session 정보 :
Warning: Undefined array key "sesstry" in /users/2019/i1919032/public_html/2022/WebProg/ch10/test10-04.php on line 12