Ticket #39774: functions.2.diff

functions.php

@@ -2054 +2054 @@
         if ( $unique_filename_callback && is_callable( $unique_filename_callback ) ) {
                 $filename = call_user_func( $unique_filename_callback, $dir, $name, $ext );
         } else {
-                $number = '';
+                $number = 0;
 
                 // Change '.ext' to lower case.
                 if ( $ext && strtolower($ext) != $ext ) {