diff --git a/resources/functions.php b/resources/functions.php
index 2f740e7c61..e400c726a0 100644
--- a/resources/functions.php
+++ b/resources/functions.php
@@ -106,6 +106,14 @@
 		//echo uuid();
 	}
 
+	if (!function_exists('is_uuid')) {
+		function is_uuid($uuid) {
+			//uuid version 4
+			$regex = '/^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i';
+			return preg_match($regex, $uuid);
+		}
+	}
+
 	if (!function_exists('recursive_copy')) {
 		function recursive_copy($src,$dst) {
 			$dir = opendir($src);