세션ID :
session1 :
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Warning: Trying to access array offset on null in /users/2018/i1858026/public_html/2019/webprog/ch10/exam10-06.php on line 12

session2 :
Warning: Undefined global variable $_SESSION in /users/2018/i1858026/public_html/2019/webprog/ch10/exam10-06.php on line 13

Warning: Trying to access array offset on null in /users/2018/i1858026/public_html/2019/webprog/ch10/exam10-06.php on line 13

session3 :
Warning: Undefined global variable $_SESSION in /users/2018/i1858026/public_html/2019/webprog/ch10/exam10-06.php on line 14

Warning: Trying to access array offset on null in /users/2018/i1858026/public_html/2019/webprog/ch10/exam10-06.php on line 14

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