세션ID : ko4f5hhmav6l2jbvl4vvj7l831
session1 :
Warning: Undefined array key "session1" in /users/2016/i1658022/public_html/2019/webprog/ch10/exam10-07.php on line 14

session2 :
Warning: Undefined array key "session2" in /users/2016/i1658022/public_html/2019/webprog/ch10/exam10-07.php on line 15

session3 :
Warning: Undefined array key "session3" in /users/2016/i1658022/public_html/2019/webprog/ch10/exam10-07.php on line 16

세션설정
세션확인
모든세션변수삭제
세션삭제