About Isset using the Generate can ' t use function return value in write context error

This problem arises when using isset to detect whether a value exists for a session

Translation: You cannot use the return value of a function in a filled-in content. Then I looked at the PHP manual to see the use of the Isset function : isset () can only be used for variables, because passing any other parameter will result in parsing errors.

Therefore, the return value is not a variable, resulting in an error. My error code was like this.

if (! Isset (session (' ID ')) | |! Isset (Session (' account ')) {    $this->redirect (' Login/index ');}

The changed code is

      $id =session (' id ');      $account =session (' account ');      if (!isset session (' ID ')) | |! Isset ($account)) {          $this->redirect (' Login/index ');      }

About Isset using the Generate can ' t use function return value in write context error