这个问题视频教程中没有详细讲解。是不是这样：因为php不支持块级作用域，所以变量会在函数或循环之外存在。解决办法是使用‘unset‘将变量及时销毁。希望老师能给个详细的解答，谢谢~
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public function searchMaterial($keyname,$username){ $materialSer = D...
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<?php//1、创建数据库连接对象$mysqli = new MySQLi("localhost","root","123456",...
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我觉得建立多表关系可以通过在主表中建立个类型表id,通过id关联。或者建一张关系表，表中放两个表的id进行关联
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