diff --git a/main.php b/main.php
index a493e4551..860d374e7 100644
--- a/main.php
+++ b/main.php
@@ -65,6 +65,15 @@ if (function_exists('mb_http_output')) {
 	mb_internal_encoding('UTF-8');
 }
 
+/*
+ * This is for versions of PHP prior to version 5.2
+ */
+if (!function_exists('array_fill_keys')) {
+   function array_fill_keys($keys,$value) {
+      return array_combine($keys,array_fill(0,count($keys),$value));
+   }
+}
+
 Session::start();
 
 // IIS will sometimes generate this.