php 的传递是用的指针方式 你现在的问题是sex 或者 musicclass变量没有赋值 我建议你把你的sex=$sex 之间填加一个中间变量 比如:$sex1=$sex;
$querystring="select * from musiconline where sex=$sex1 and musicclass=$musicclass and musicid between $pagenum-14 and $pagenum order by musicid desc";
$querystring="select * from musiconline where sex=$sex1 and musicclass=$musicclass and musicid between $pagenum-14 and $pagenum order by musicid desc";
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