hocam yine hata aldım :s
Fatal error: Uncaught Error: Using $this when not in object context in C:\xampp\htdocs\login.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\login.php on line 15
Fatal error: Uncaught Error: Using $this when not in object context in C:\xampp\htdocs\login.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\login.php on line 15
$this->dbapp yerine $db olacakmış, gözden kaçmış :D