[FEATURE] php8 compatibility.

- Fixed possible error causing parameters not to be set properly when using partialGroup.
- Removed unused import reference.
- Added unit-tests.

src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php

@@ -31,7 +31,7 @@ class ClassLoader implements IClassLoader
      */
     public function loadClosure(Callable $closure, array $parameters)
     {
-        return \call_user_func_array($closure, $parameters);
+        return \call_user_func_array($closure, array_values($parameters));
     }
 
 }

src/Pecee/SimpleRouter/Route/Route.php

@@ -2,7 +2,6 @@
 
 namespace Pecee\SimpleRouter\Route;
 
-use Pecee\Http\Middleware\IMiddleware;
 use Pecee\Http\Request;
 use Pecee\SimpleRouter\Exceptions\ClassNotFoundHttpException;
 use Pecee\SimpleRouter\Exceptions\NotFoundHttpException;
@@ -153,12 +152,22 @@ abstract class Route implements IRoute
 
         if (isset($parameters[1]) === true) {
 
+            $groupParameters = $this->getGroup() !== null ? $this->getGroup()->getParameters() : [];
+
             /* Only take matched parameters with name */
             foreach ((array)$parameters[1] as $name) {
+
+                // Skip parent parameters
+                if(isset($groupParameters[$name]) === true) {
+                    continue;
+                }
+
                 $values[$name] = (isset($matches[$name]) === true && $matches[$name] !== '') ? $matches[$name] : null;
             }
         }
 
+        $this->originalParameters = $values;
+
         return $values;
     }
 
@@ -477,14 +486,6 @@ abstract class Route implements IRoute
      */
     public function setParameters(array $parameters): IRoute
     {
-        /*
-         * If this is the first time setting parameters we store them so we
-         * later can organize the array, in case somebody tried to sort the array.
-         */
-        if (\count($parameters) !== 0 && \count($this->originalParameters) === 0) {
-            $this->originalParameters = $parameters;
-        }
-
         $this->parameters = array_merge($this->parameters, $parameters);
 
         return $this;

tests/Pecee/SimpleRouter/RouterPartialGroupTest.php

@@ -70,4 +70,47 @@ class RouterPartialGroupTest extends \PHPUnit\Framework\TestCase
 
     }
 
+    public function testPhp8CallUserFunc() {
+
+        TestRouter::router()->reset();
+
+        $result = false;
+        $lang = 'de';
+
+        TestRouter::group(['prefix' => '/lang'], function() use(&$result) {
+            TestRouter::get('/{lang}', function ($lang) use(&$result) {
+                $result = $lang;
+            });
+        });
+
+        TestRouter::debug("/lang/$lang");
+
+        $this->assertEquals($lang, $result);
+
+        // Test partial group
+
+        $lang = 'de';
+        $userId = 22;
+
+        $result1 = false;
+        $result2 = false;
+
+        TestRouter::partialGroup(
+            '/lang/{lang}/',
+            function ($lang) use(&$result1, &$result2) {
+
+                $result1 = $lang;
+
+                TestRouter::get('/user/{userId}', function ($userId) use(&$result2) {
+                    $result2 = $userId;
+                });
+            });
+
+        TestRouter::debug("/lang/$lang/user/$userId");
+
+        $this->assertEquals($lang, $result1);
+        $this->assertEquals($userId, $result2);
+
+    }
+
 }