Replace is array by is iterable

Author: Jeremiah VALERIE

Resolver/AccessResolver.php

@@ -71,7 +71,7 @@ private function processFilter($result, $accessChecker, $resolveArgs)
         /** @var ResolveInfo $resolveInfo */
         $resolveInfo = $resolveArgs[3];
 
-        if (\is_array($result) && $resolveInfo->returnType instanceof ListOfType) {
+        if (self::isIterable($result) && $resolveInfo->returnType instanceof ListOfType) {
             $result = array_map(
                 function ($object) use ($accessChecker, $resolveArgs) {
                     return $this->hasAccess($accessChecker, $object, $resolveArgs) ? $object : null;
@@ -101,4 +101,18 @@ private function hasAccess(callable $accessChecker, $object, array $resolveArgs
 
         return $access;
     }
+
+    /**
+     * @param mixed $data
+     *
+     * @return bool
+     */
+    private static function isIterable($data)
+    {
+        if (function_exists('is_iterable')) {
+            return \is_iterable($data);
+        } else {
+            return \is_array($data) || (\is_object($data) && ($data instanceof \Traversable));
+        }
+    }
 }