英语语法分析

Also, if you would want to go for unsetting every variable you do not use - don't.

还有，如果你想去取消每个变量你不——不要使用。

This destructor would have to be called specifically before unsetting the parent class reference.

这种解构器必须在解除父类引用之前进行调用。

The first step is to make sure that the user is logged out by unsetting the relevant session variables.

第一步，确保用户是通过取消相关会话变量来进行注销的。