Fixed passing no arguments to array_merge

Author: wouterj

src/ChainRouteCollection.php

@@ -241,6 +241,10 @@ public function setMethods($methods)
      */
     public function getResources()
     {
+        if (0 === count($this->routeCollections)) {
+            return [];
+        }
+
         $resources = array_map(function (RouteCollection $routeCollection) {
             return $routeCollection->getResources();
         }, $this->routeCollections);

src/ChainRouter.php

@@ -124,12 +124,12 @@ public function all()
      */
     protected function sortRouters()
     {
-        krsort($this->routers);
-
         if (0 === count($this->routers)) {
             return [];
         }
 
+        krsort($this->routers);
+
         return call_user_func_array('array_merge', $this->routers);
     }
 

src/DynamicRouter.php

@@ -348,12 +348,12 @@ public function getRouteEnhancers()
      */
     protected function sortRouteEnhancers()
     {
-        krsort($this->enhancers);
-
         if (0 === count($this->enhancers)) {
             return [];
         }
 
+        krsort($this->enhancers);
+
         return call_user_func_array('array_merge', $this->enhancers);
     }
 

src/NestedMatcher/NestedMatcher.php

@@ -175,6 +175,10 @@ public function getRouteFilters()
      */
     protected function sortFilters()
     {
+        if (0 === count($this->filters)) {
+            return [];
+        }
+
         krsort($this->filters);
 
         return call_user_func_array('array_merge', $this->filters);