symfony
diff --git a/‎components/expression_language/extending.rst
Copy file name to clipboardExpand all lines: components/expression_language/extending.rst
+1-5Lines changed: 1 addition & 5 deletions b/‎components/expression_language/extending.rst
Copy file name to clipboardExpand all lines: components/expression_language/extending.rst
+1-5Lines changed: 1 addition & 5 deletions
@@ -35,11 +35,7 @@ This method has 3 arguments:
 
     $language = new ExpressionLanguage();
     $language->register('lowercase', function ($str) {
-        if (!is_string($str)) {
-            return $str;
-        }
-
-        return sprintf('strtolower(%s)', $str);
+        return sprintf('$result = (is_string(%1$s)) ? strtolower(%1$s) : %1$s; return $result;', $str);
     }, function ($arguments, $str) {
         if (!is_string($str)) {
             return $str;