세션ID :
session1 :
Warning: Undefined global variable $_SESSION in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-07.php on line 11

Warning: Trying to access array offset on null in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-07.php on line 11

session2 :
Warning: Undefined global variable $_SESSION in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-07.php on line 12

Warning: Trying to access array offset on null in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-07.php on line 12

session3 :
Warning: Undefined global variable $_SESSION in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-07.php on line 13

Warning: Trying to access array offset on null in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-07.php on line 13

세션확인
세션변수 session1 삭제
세션설정
세션삭제