세션 ID : adtnrk39n2mpor759bf7pbgi9e
session1 :
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session2 :
Warning: Undefined array key "session2" in /users/2021/i2151058/public_html/2022/WebProg/ch10/exam10-05.php on line 11

session3 :
Warning: Undefined array key "session3" in /users/2021/i2151058/public_html/2022/WebProg/ch10/exam10-05.php on line 12

>세션설정
>세션 변수 session1 삭제
>모든세션변수삭제
>세션삭제