세션확인 세션 ID : imv67g25dotcvi4224u430u5mm
session1 :
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session2 :
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session3 :
Warning: Undefined array key "session3" in /users/2019/i1919029/public_html/2022/WebProg/ch10/exam10-05.php on line 12

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모든세션변수삭제
세션삭제