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Warning: session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in /users/2021/i2151058/public_html/2022/WebProg/ch10/exam10-04.php on line 1
세션 ID :
>세션확인
>세션 변수 session1 삭제
>모든세션변수삭제
>세션삭제