public function invoke($filter) { $AllDoctors = new DoctorView(); if ($filter == "") { if (isset($_SESSION['role']) && $_SESSION['role'] == "Administrator") { $AllDoctors->showDoctors(); } else { $AllDoctors->showDoctorsONLY(); } } else { if (isset($_SESSION['role']) && $_SESSION['role'] == "Administrator") { $AllDoctors->showDoctorsfiltered($filter); } else { $AllDoctors->showDoctorsfilteredONLY($filter); } } }