From 8aa9ddd7de3d8e5abb18acd7ba3b087f54886d0d Mon Sep 17 00:00:00 2001
From: Kevin Verschaeve <kevin.verschaeve@live.fr>
Date: Sat, 12 May 2018 16:36:31 +0200
Subject: [PATCH 1/2] [ExpressionLanguage] Add missing argument in example code

---
 components/expression_language/extending.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/expression_language/extending.rst b/components/expression_language/extending.rst
index 4c766c4cddc..cb60cee8eb4 100644
--- a/components/expression_language/extending.rst
+++ b/components/expression_language/extending.rst
@@ -34,7 +34,7 @@ This method has 3 arguments:
     use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
 
     $expressionLanguage = new ExpressionLanguage();
-    $expressionLanguage->register('lowercase', function ($str) {
+    $expressionLanguage->register('lowercase', function ($arguments, $str) {
         return sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str);
     }, function ($arguments, $str) {
         if (!is_string($str)) {

From daa6a770be35cc83a4468247ab21369a9885166d Mon Sep 17 00:00:00 2001
From: Javier Eguiluz <javier.eguiluz@gmail.com>
Date: Wed, 27 Jun 2018 15:28:09 +0200
Subject: [PATCH 2/2] Reword

---
 components/expression_language/extending.rst | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/components/expression_language/extending.rst b/components/expression_language/extending.rst
index cb60cee8eb4..c070184385d 100644
--- a/components/expression_language/extending.rst
+++ b/components/expression_language/extending.rst
@@ -34,7 +34,7 @@ This method has 3 arguments:
     use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
 
     $expressionLanguage = new ExpressionLanguage();
-    $expressionLanguage->register('lowercase', function ($arguments, $str) {
+    $expressionLanguage->register('lowercase', function ($str) {
         return sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str);
     }, function ($arguments, $str) {
         if (!is_string($str)) {
@@ -45,11 +45,11 @@ This method has 3 arguments:
     });
 
     var_dump($expressionLanguage->evaluate('lowercase("HELLO")'));
+    // this will print: hello
 
-This will print ``hello``. Both the **compiler** and **evaluator** are passed
-an ``arguments`` variable as their first argument, which is equal to the
-second argument to ``evaluate()`` or ``compile()`` (e.g. the "values" when
-evaluating or the "names" if compiling).
+In addition to the custom function arguments, the **evaluator** is passed an
+``arguments`` variable as its first argument, which is equal to the second
+argument of ``compile()`` (e.g. the "values" when evaluating an expression).
 
 .. _components-expression-language-provider: