Use Laravel's class-based Str and Arr helpers

Starting with version 5.9, the global funtions will be deprecated.

* https://laravel-news.com/laravel-5-8-deprecates-string-and-array-helpers
* https://github.com/laravel/framework/pull/26898

src/Http/Middleware/AuthenticateWithHeader.php

@@ -14,6 +14,7 @@ namespace Flarum\Http\Middleware;
 use Flarum\Api\ApiKey;
 use Flarum\Http\AccessToken;
 use Flarum\User\User;
+use Illuminate\Support\Str;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Http\Server\MiddlewareInterface as Middleware;
@@ -29,7 +30,7 @@ class AuthenticateWithHeader implements Middleware
 
         $parts = explode(';', $headerLine);
 
-        if (isset($parts[0]) && starts_with($parts[0], self::TOKEN_PREFIX)) {
+        if (isset($parts[0]) && Str::startsWith($parts[0], self::TOKEN_PREFIX)) {
             $id = substr($parts[0], strlen(self::TOKEN_PREFIX));
 
             if ($key = ApiKey::where('key', $id)->first()) {

src/Http/Middleware/ParseJsonBody.php

@@ -11,6 +11,7 @@
 
 namespace Flarum\Http\Middleware;
 
+use Illuminate\Support\Str;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Http\Server\MiddlewareInterface as Middleware;
@@ -20,7 +21,7 @@ class ParseJsonBody implements Middleware
 {
     public function process(Request $request, Handler $handler): Response
     {
-        if (str_contains($request->getHeaderLine('content-type'), 'json')) {
+        if (Str::contains($request->getHeaderLine('content-type'), 'json')) {
             $input = json_decode($request->getBody(), true);
 
             $request = $request->withParsedBody($input ?: []);

src/Http/Middleware/RememberFromCookie.php

@@ -13,6 +13,7 @@ namespace Flarum\Http\Middleware;
 
 use Flarum\Http\AccessToken;
 use Flarum\Http\CookieFactory;
+use Illuminate\Support\Arr;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Http\Server\MiddlewareInterface as Middleware;
@@ -35,7 +36,7 @@ class RememberFromCookie implements Middleware
 
     public function process(Request $request, Handler $handler): Response
     {
-        $id = array_get($request->getCookieParams(), $this->cookie->getName('remember'));
+        $id = Arr::get($request->getCookieParams(), $this->cookie->getName('remember'));
 
         if ($id) {
             $token = AccessToken::find($id);

src/Http/Middleware/SetLocale.php

@@ -12,6 +12,7 @@
 namespace Flarum\Http\Middleware;
 
 use Flarum\Locale\LocaleManager;
+use Illuminate\Support\Arr;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Http\Server\MiddlewareInterface as Middleware;
@@ -39,7 +40,7 @@ class SetLocale implements Middleware
         if ($actor->exists) {
             $locale = $actor->getPreference('locale');
         } else {
-            $locale = array_get($request->getCookieParams(), 'locale');
+            $locale = Arr::get($request->getCookieParams(), 'locale');
         }
 
         if ($locale && $this->locales->hasLocale($locale)) {

src/Http/Middleware/StartSession.php

@@ -16,6 +16,7 @@ use Flarum\Http\CookieFactory;
 use Illuminate\Contracts\Config\Repository as ConfigRepository;
 use Illuminate\Contracts\Session\Session;
 use Illuminate\Session\Store;
+use Illuminate\Support\Arr;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Http\Server\MiddlewareInterface as Middleware;
@@ -72,7 +73,7 @@ class StartSession implements Middleware
         return new Store(
             $this->config['cookie'],
             $this->handler,
-            array_get($request->getCookieParams(), $this->cookie->getName($this->config['cookie']))
+            Arr::get($request->getCookieParams(), $this->cookie->getName($this->config['cookie']))
         );
     }