diff --git a/Curl.class.php b/Curl.class.php
index deb780d..3508454 100644
--- a/Curl.class.php
+++ b/Curl.class.php
@@ -98,9 +98,7 @@ class Curl {
 
     function _postfields($data) {
         if (is_array($data)) {
-            $multidimensional = !(count($data) === count($data, COUNT_RECURSIVE));
-
-            if ($multidimensional) {
+            if (is_array_multidim($data)) {
                 $data = $this->http_build_multi_query($data);
             }
             else {
@@ -169,3 +167,11 @@ class Curl {
     public $response_headers = NULL;
     public $response = NULL;
 }
+
+function is_array_multidim($array) {
+    if (!is_array($array)) {
+        return FALSE;
+    }
+
+    return !(count($array) === count($array, COUNT_RECURSIVE));
+}