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PHPMyWind安全警告：MySql Error！

错误文件：/about.php
错误信息：You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 Error sql: SELECT `classname` FROM `wish_infoclass` WHERE `id`=

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Notice: Undefined variable: cid in D:\wwwroot\lnws\wwwroot\about.php on line 136
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