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$this->isLogin();

isLogin() This method is not in your class; you need to add a new isLogin();$this-> in the class to obtain the non-static properties of the current object For example:

class?Index?extends?Base
{
???public?function?index()
???{
???????$this->isLogin();???//判斷用戶是否登錄
???????return?$this->view->fetch();
???}
???public?isLogin(){
???????#code?判斷用戶是否登錄
???}
}

Then there must be something wrong with this method, isLogin()

After adding the following sentence, the page is wrong

$this->isLogin(); //Determine whether the user is logged in