세션ID :
session1 :
Warning: Undefined global variable $_SESSION in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-05.php on line 9

Warning: Trying to access array offset on null in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-05.php on line 9

session2 :
Warning: Undefined global variable $_SESSION in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-05.php on line 10

Warning: Trying to access array offset on null in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-05.php on line 10

session3 :
Warning: Undefined global variable $_SESSION in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-05.php on line 11

Warning: Trying to access array offset on null in /users/2021/i2151005/public_html/2022/WebProg/ch10/exam10-05.php on line 11

세션설정
세션변수 session1 삭제
모든 세션변수삭제
세션삭제