From 592623f0c32823fe54457549261f98de2b4b7f11 Mon Sep 17 00:00:00 2001
From: qadan <daitken@discoverygarden.ca>
Date: Thu, 14 Jul 2016 13:42:19 -0300
Subject: [PATCH] accounting for PHP weirdness

---
 islandora.api.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/islandora.api.php b/islandora.api.php
index 3ec7fa74..a50a0c24 100644
--- a/islandora.api.php
+++ b/islandora.api.php
@@ -759,7 +759,8 @@ function hook_islandora_derivative_alter(&$derivatives, AbstractObject $object,
     'dateLastModified' => NULL,
     'dsid' => NULL,
   );
-  if (empty(array_diff_key($ds_modified_params, $mask))) {
+  $param_diff = array_diff_key($ds_modified_params, $mask);
+  if (empty($param_diff)) {
     $derivatives = array();
   }
 }