diff --git a/main/inc/lib/array.lib.php b/main/inc/lib/array.lib.php
old mode 100755
new mode 100644
index b2d1c40d6c..77230ac549
--- a/main/inc/lib/array.lib.php
+++ b/main/inc/lib/array.lib.php
@@ -107,4 +107,11 @@ function utf8_sort($array) {
 	}
 	setlocale(LC_COLLATE, $old_locale);	
 	return $array;
+}
+
+function array_to_string($array, $separator = ',') {
+    if (empty($array)) {
+        return '';
+    }
+    return implode($separator.' ', $array);
 }
\ No newline at end of file