Add smarty modifer in_array

resources/templates/engine/smarty/plugins/modifier.in_array.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifier
+ */
+
+/**
+ * Smarty in_array modifier plugin
+ * Type:     modifier
+ * Name:     in_array
+ * Purpose:  Checks if a value exists in an array
+ *
+ * @param string  $needle
+ * @param array   $haystack
+ *
+ * @return boolean
+ */
+function smarty_modifier_in_array($needle, $haystack)
+{
+    return in_array($needle, $haystack);
+}