diff --git a/htdocs/core/lib/files.lib.php b/htdocs/core/lib/files.lib.php
index e555e50b4db..4240cd0ec45 100644
--- a/htdocs/core/lib/files.lib.php
+++ b/htdocs/core/lib/files.lib.php
@@ -3229,6 +3229,17 @@ function dol_readcachefile($directory, $filename)
 	return $object;
 }
 
+/**
+ * Return the relative dirname (relative to DOL_DATA_ROOT) of a full path string.
+ *
+ * @param 	string $pathfile		Full path of a file
+ * @return 	string					Path of file relative to DOL_DATA_ROOT
+ */
+function dirbasename($pathfile)
+{
+	return preg_replace('/^'.preg_quote(DOL_DATA_ROOT, '/').'\//', '', $pathfile);
+}
+
 
 /**
  * Function to get list of updated or modified files.