Ticket #19121: 19121.2.diff

src/wp-includes/functions.php

@@ -1993 +1993 @@
                 }
         }
 
-        return $filename;
+        /**
+         * Filter the filename.
+         *
+         * @since 4.5.0
+         *
+         * @param  string   $filename                 File name.
+         * @param  string   $ext                      File extension.
+         * @param  string   $dir                      Directory.
+         * @param  callable $unique_filename_callback Callback. Default null.
+         */
+        return apply_filters( 'wp_unique_filename', $filename, $ext, $dir, $unique_filename_callback );
 }
 
 /**