세션ID : goqudrdr22mp1lcds4t7l883g3
session1 :
Warning: Undefined array key "session1" in /users/2000/i0058001/public_html/2022/WebProg/ch10/test10-04.php on line 10

session2 :
Warning: Undefined array key "session2" in /users/2000/i0058001/public_html/2022/WebProg/ch10/test10-04.php on line 11

session3 :
Warning: Undefined array key "session3" in /users/2000/i0058001/public_html/2022/WebProg/ch10/test10-04.php on line 12

세션설정
세션변수 session1 삭제
모든세션변수삭제
세션삭제