세션 ID : jpfigplre2ertuh4qon37vbhit
session1 :
Warning: Undefined array key "session1" in /users/2019/i1919056/public_html/2022/WebProg/ch10/exam10-08.php on line 13

session2 :
Warning: Undefined array key "session2" in /users/2019/i1919056/public_html/2022/WebProg/ch10/exam10-08.php on line 14

session3 :
Warning: Undefined array key "session3" in /users/2019/i1919056/public_html/2022/WebProg/ch10/exam10-08.php on line 15

세션설정
세션확인
세션변수 session1 삭제
모든세션변수삭제