我新建一个对象
$mydb = new DataBase("localhost","root","","dbName"); $mydb = new DataBase("localhost","ro
$mydb = new DataBase("localhost","root","","dbName"); $mydb = new DataBase("localhost","ro
阅读背景：
php如何释放一个class对象？对象里面的变量还要在析构函数里面释放吗？
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