Correção do ArraySerializer.php

Author: jeffersongoncalves

composer.json

@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": ">=7.0",
+        "php": "^7.1",
         "cakephp/cakephp": "^3.6",
         "league/fractal": ">=0.13.0"
     },

src/Serializer/ArraySerializer.php

@@ -9,12 +9,12 @@ class ArraySerializer extends Serializer
     /**
      * Serialize a collection.
      *
-     * @param string $resourceKey resource key
-     * @param array  $data        data
+     * @param string|null $resourceKey resource key
+     * @param array $data data
      *
      * @return array
      */
-    public function collection($resourceKey, array $data)
+    public function collection(?string $resourceKey, array $data): array
     {
         return $data;
     }