fix empty array in nested array not being translated to empty json co…

src/HttpDriver/Session.php

@@ -193,6 +193,7 @@ public function prepareRequest(Pipeline $pipeline)
         $body = json_encode([
             'statements' => $statements,
         ]);
+
         $headers = [
             [
                 'X-Stream' => true,
@@ -205,15 +206,11 @@ public function prepareRequest(Pipeline $pipeline)
 
     private function formatParams(array $params)
     {
-        foreach ($params as $key => $v) {
-            if (is_array($v)) {
-                if (empty($v)) {
-                    $params[$key] = new \stdClass();
-                } else {
-                    $params[$key] = $this->formatParams($params[$key]);
-                }
+        array_walk_recursive($params, function(&$v, $k) {
+            if (is_array($v) && count($v) === 0) {
+                $v = new \stdClass();
             }
-        }
+        });
 
         return $params;
     }

tests/Issues/Issue99Test.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace GraphAware\Neo4j\Client\Tests\Issues;
+
+use GraphAware\Neo4j\Client\Tests\Integration\IntegrationTestCase;
+
+/**
+ * Class Issue99Test
+ * @package GraphAware\Neo4j\Client\Tests\Issues
+ *
+ * @group issue-99
+ */
+class Issue99Test extends IntegrationTestCase
+{
+    public function testEmptyArrayCanBePassedAsParameter()
+    {
+        $q = 'CREATE (n:Person) SET n += {props} RETURN id(n)';
+        $params = ['props' => ['id' => 123, 'some' => []]];
+
+        $result = $this->client->run($q, $params);
+
+        $this->assertEquals(1, $result->size());
+    }
+}