세션 ID : 5dvlbce3b4rvdm0k66lvbdh6qs
session1 :
Warning: Undefined array key "session1" in /users/2021/i2151058/public_html/2022/WebProg/ch10/exam10-07.php on line 13

session2 :
Warning: Undefined array key "session2" in /users/2021/i2151058/public_html/2022/WebProg/ch10/exam10-07.php on line 14

session3 :
Warning: Undefined array key "session3" in /users/2021/i2151058/public_html/2022/WebProg/ch10/exam10-07.php on line 15

>세션설정
>세션확인
>세션변수 session1 삭제
>세션삭제