세션ID :
session1 :
Warning: Undefined global variable $_SESSION in /users/2018/i1858012/public_html/2019/webprog/ch10/exam10-05.php on line 10

Warning: Trying to access array offset on null in /users/2018/i1858012/public_html/2019/webprog/ch10/exam10-05.php on line 10

session2 :
Warning: Undefined global variable $_SESSION in /users/2018/i1858012/public_html/2019/webprog/ch10/exam10-05.php on line 11

Warning: Trying to access array offset on null in /users/2018/i1858012/public_html/2019/webprog/ch10/exam10-05.php on line 11

session3 :
Warning: Undefined global variable $_SESSION in /users/2018/i1858012/public_html/2019/webprog/ch10/exam10-05.php on line 12

Warning: Trying to access array offset on null in /users/2018/i1858012/public_html/2019/webprog/ch10/exam10-05.php on line 12

세션설정
세션변수 session1 삭제
모든세션변수삭제
세션삭제