Fix PHP 8 router parameter dispatching and lesson slug playback lookup

backend/app/Core/Request.php

@@ -13,6 +13,7 @@ class Request
     private array $queryParams;
     private array $bodyParams;
     private array $headers;
+    private array $routeParams = [];
 
     // Explicit properties to store authentication details to avoid deprecation warnings in PHP 8.2+
     public ?int $user_id = null;
@@ -78,6 +79,21 @@ class Request
         $this->queryParams = $queryParams;
     }
 
+    public function setParams(array $params): void
+    {
+        $this->routeParams = $params;
+    }
+
+    public function getParams(): array
+    {
+        return $this->routeParams;
+    }
+
+    public function getParam(string $key, $default = null)
+    {
+        return $this->routeParams[$key] ?? $default;
+    }
+
     public function get(string $key, $default = null)
     {
         return $this->bodyParams[$key] ?? ($this->queryParams[$key] ?? $default);

backend/app/Core/Router.php

@@ -88,6 +88,7 @@ class Router
             if ($route['method'] === $method && preg_match($route['pattern'], $path, $matches)) {
                 // Filter named captures from regex match
                 $params = array_filter($matches, 'is_string', ARRAY_FILTER_USE_KEY);
+                $request->setParams($params);
 
                 // Run global middleware first
                 foreach ($this->globalMiddleware as $mw) {
@@ -108,13 +109,20 @@ class Router
                     if (class_exists($controllerClass)) {
                         $controller = new $controllerClass();
                         if (method_exists($controller, $action)) {
-                            // Call action with Request, Response and URI dynamic parameters
-                            call_user_func_array([$controller, $action], array_merge([$request, $response], $params));
+                            $ref = new \ReflectionMethod($controller, $action);
+                            $paramCount = $ref->getNumberOfParameters();
+                            if ($paramCount <= 2) {
+                                $controller->$action($request, $response);
+                            } else {
+                                $args = array_values(array_merge([$request, $response], array_values($params)));
+                                call_user_func_array([$controller, $action], $args);
+                            }
                             return;
                         }
                     }
                 } elseif (is_callable($handler)) {
-                    call_user_func_array($handler, array_merge([$request, $response], $params));
+                    $args = array_values(array_merge([$request, $response], array_values($params)));
+                    call_user_func_array($handler, $args);
                     return;
                 }