세션ID : qbtel3uqk01jttq3fghj13sk4o
session1 :
Warning: Undefined array key "session1" in /users/2019/i1919001/public_html/2022/WebProg/ch10/exam10-05.php on line 10

session2 :
Warning: Undefined array key "session2" in /users/2019/i1919001/public_html/2022/WebProg/ch10/exam10-05.php on line 11

session3 :
Warning: Undefined array key "session3" in /users/2019/i1919001/public_html/2022/WebProg/ch10/exam10-05.php on line 12

세션설정
세션변수 session1 삭제
모든세션변수삭제
세션삭제