From db1b03b13f00f760039e18fe74aa30fc5e8b639e Mon Sep 17 00:00:00 2001
From: Thomas Landauer <thomas@landauer.at>
Date: Sat, 27 Oct 2018 23:14:29 +0200
Subject: [PATCH 1/3] Update twig_extension.rst

Added example for custom function
---
 templating/twig_extension.rst | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/templating/twig_extension.rst b/templating/twig_extension.rst
index e9a58badd5d..1f863bf022b 100644
--- a/templating/twig_extension.rst
+++ b/templating/twig_extension.rst
@@ -62,9 +62,32 @@ As an example you'll create a price filter to format a given number into price::
     versions before 1.26, include this method which is omitted in the example
     above.
 
+Here's how to create a custom **function**::
+
+    // src/AppBundle/Twig/AppExtension.php
+    namespace AppBundle\Twig;
+
+    use Twig\Extension\AbstractExtension;
+    use Twig\TwigFunction;
+
+    class AppExtension extends AbstractExtension
+    {
+        public function getFunctions()
+        {
+            return array(
+                new TwigFunction('total', array($this, 'totalFunction')),
+            );
+        }
+
+        public function totalFunction(float $price, int $quantity)
+        {
+            return $price * $quantity;
+        }
+    }
+
 .. tip::
 
-    Along with custom filters, you can also add custom `functions`_ and register
+    Along with custom filters and functions, you can also register
     `global variables`_.
 
 Register an Extension as a Service

From 23ef8d63f1fd464e1ef217009a8a55e8ccffbf8c Mon Sep 17 00:00:00 2001
From: Thomas Landauer <thomas@landauer.at>
Date: Mon, 29 Oct 2018 12:05:27 +0100
Subject: [PATCH 2/3] Update twig_extension.rst

As requested :-)
https://github.com/symfony/symfony-docs/pull/10593
---
 templating/twig_extension.rst | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/templating/twig_extension.rst b/templating/twig_extension.rst
index 1f863bf022b..4ee6330d771 100644
--- a/templating/twig_extension.rst
+++ b/templating/twig_extension.rst
@@ -41,11 +41,11 @@ As an example you'll create a price filter to format a given number into price::
         public function getFilters()
         {
             return array(
-                new TwigFilter('price', array($this, 'priceFilter')),
+                new TwigFilter('price', array($this, 'formatPrice')),
             );
         }
 
-        public function priceFilter($number, $decimals = 0, $decPoint = '.', $thousandsSep = ',')
+        public function formatPrice($number, $decimals = 0, $decPoint = '.', $thousandsSep = ',')
         {
             $price = number_format($number, $decimals, $decPoint, $thousandsSep);
             $price = '$'.$price;
@@ -75,11 +75,11 @@ Here's how to create a custom **function**::
         public function getFunctions()
         {
             return array(
-                new TwigFunction('total', array($this, 'totalFunction')),
+                new TwigFunction('total', array($this, 'calculateTotal')),
             );
         }
 
-        public function totalFunction(float $price, int $quantity)
+        public function calculateTotal(float $price, int $quantity)
         {
             return $price * $quantity;
         }

From 04e7e45c60b22b84405fa690c4ecac77fa30c607 Mon Sep 17 00:00:00 2001
From: Thomas Landauer <thomas@landauer.at>
Date: Tue, 30 Oct 2018 13:15:56 +0100
Subject: [PATCH 3/3] Update twig_extension.rst

See https://github.com/symfony/symfony-docs/pull/10593#discussion_r229209283
---
 templating/twig_extension.rst | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/templating/twig_extension.rst b/templating/twig_extension.rst
index 4ee6330d771..e1b5350ab78 100644
--- a/templating/twig_extension.rst
+++ b/templating/twig_extension.rst
@@ -75,13 +75,13 @@ Here's how to create a custom **function**::
         public function getFunctions()
         {
             return array(
-                new TwigFunction('total', array($this, 'calculateTotal')),
+                new TwigFunction('total', array($this, 'calculateArea')),
             );
         }
 
-        public function calculateTotal(float $price, int $quantity)
+        public function calculateArea(int $width, int $length)
         {
-            return $price * $quantity;
+            return $width * $length;
         }
     }