Replaced functions with mb_* equivalents

src/Middleware/RequestHandler.php

@@ -67,7 +67,7 @@ class RequestHandler implements MiddlewareInterface
      */
     protected function resolveRequestHandler($handler)
     {
-        if (is_string($handler) && strpos($handler, '@') !== false) {
+        if (is_string($handler) && mb_strpos($handler, '@') !== false) {
             list($class, $method) = explode('@', $handler, 2);
             if (!class_exists($class) && !$this->container->has($class)) {
                 $class = sprintf('Engelsystem\\Controllers\\%s', $class);

src/Renderer/HtmlEngine.php

@@ -29,6 +29,6 @@ class HtmlEngine implements EngineInterface
      */
     public function canRender($path)
     {
-        return strpos($path, '.htm') && file_exists($path);
+        return mb_strpos($path, '.htm') !== false && file_exists($path);
     }
 }

src/Renderer/TwigLoader.php

@@ -16,8 +16,8 @@ class TwigLoader extends FilesystemLoader
     public function findTemplate($name, $throw = true)
     {
         $extension = '.twig';
-        $extensionLength = strlen($extension);
-        if (substr($name, -$extensionLength, $extensionLength) !== $extension) {
+        $extensionLength = mb_strlen($extension);
+        if (mb_substr($name, -$extensionLength, $extensionLength) !== $extension) {
             $name .= $extension;
         }
 

tests/Unit/Database/Migration/MigrateTest.php

@@ -92,7 +92,7 @@ class MigrateTest extends TestCase
         ) {
             $contains = false;
             foreach ($messages as $message) {
-                if (!Str::contains(strtolower($message), $type) || !Str::contains(strtolower($message), $value)) {
+                if (!Str::contains(mb_strtolower($message), $type) || !Str::contains(mb_strtolower($message), $value)) {
                     continue;
                 }