Code cleanup from inspection results

app/Http/Controllers/Frontend/AirportController.php

@@ -28,6 +28,9 @@ class AirportController extends Controller
      * Show the airport
      *
      * @param mixed $id
+     *
+     * @return mixed
+     * @return \Illuminate\Contracts\View\Factory|\Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector|\Illuminate\View\View
      */
     public function show($id, Request $request)
     {

app/Http/Controllers/Frontend/DownloadController.php

@@ -54,7 +54,10 @@ class DownloadController extends Controller
     /**
      * Show the application dashboard.
      *
-     * @param mixed $id
+     * @param string $id
+     *
+     * @return mixed
+     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector|\Symfony\Component\HttpFoundation\StreamedResponse
      */
     public function show($id)
     {

app/Http/Controllers/Frontend/PirepController.php

@@ -284,6 +284,7 @@ class PirepController extends Controller
             }
 
             // is the aircraft in the right place?
+            /** @noinspection NotOptimalIfConditionsInspection */
             if (setting('pireps.only_aircraft_at_dpt_airport')
                 && $pirep->aircraft_id !== $pirep->dpt_airport_id) {
                 return $this->flashError(
@@ -356,7 +357,7 @@ class PirepController extends Controller
 
         // set the custom fields
         foreach ($pirep->fields as $field) {
-            if ($field->slug == null) {
+            if ($field->slug === null) {
                 $field->slug = str_slug($field->name);
             }