From 3eaaf26ab241aa6635974a0f788c833096335799 Mon Sep 17 00:00:00 2001
From: Christophe Coevoet <stof@notk.org>
Date: Tue, 12 Aug 2014 15:04:39 +0200
Subject: [PATCH] Fixed the code snippets for the expression language functions

---
 components/expression_language/extending.rst | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/components/expression_language/extending.rst b/components/expression_language/extending.rst
index 94762110bcd..5f1f743d631 100644
--- a/components/expression_language/extending.rst
+++ b/components/expression_language/extending.rst
@@ -35,7 +35,7 @@ This method has 3 arguments:
 
     $language = new ExpressionLanguage();
     $language->register('lowercase', function ($str) {
-        is_string(%1$s) ? strtolower(%1$s) : %1$s;
+        return sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str);
     }, function ($arguments, $str) {
         if (!is_string($str)) {
             return $str;
@@ -69,11 +69,7 @@ Override ``registerFunctions`` to add your own functions::
             parent::registerFunctions(); // do not forget to also register core functions
 
             $this->register('lowercase', function ($str) {
-                if (!is_string($str)) {
-                    return $str;
-                }
-
-                return sprintf('strtolower(%s)', $str);
+                return sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str);
             }, function ($arguments, $str) {
                 if (!is_string($str)) {
                     return $str;