Fatal error: Uncaught TypeError: join(): Argument #2 ($array) must be of type ?array, string given in C:\inetpub\wwwroot\html\dnr\water\climate\sco\Education\take_wx_quiz.php:3 Stack trace: #0 C:\inetpub\wwwroot\html\dnr\water\climate\sco\Education\take_wx_quiz.php(3): join('', '') #1 {main} thrown in C:\inetpub\wwwroot\html\dnr\water\climate\sco\Education\take_wx_quiz.php on line 3