From e587fa8a858bf194f4b5a3e86564c973a9e11008 Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien.potencier@gmail.com>
Date: Tue, 13 Aug 2013 15:40:07 +0200
Subject: [PATCH] [Config] fixed an edge case

---
 src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php | 1 +
 src/Symfony/Component/Config/Util/XmlUtils.php           | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php b/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php
index 4ab1e70ecc..a17119260a 100644
--- a/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php
+++ b/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php
@@ -104,6 +104,7 @@ class XmlUtilsTest extends \PHPUnit_Framework_TestCase
     public function getDataForPhpize()
     {
         return array(
+            array('', ''),
             array(null, 'null'),
             array(true, 'true'),
             array(false, 'false'),
diff --git a/src/Symfony/Component/Config/Util/XmlUtils.php b/src/Symfony/Component/Config/Util/XmlUtils.php
index ef614501c5..3f96bd8f0e 100644
--- a/src/Symfony/Component/Config/Util/XmlUtils.php
+++ b/src/Symfony/Component/Config/Util/XmlUtils.php
@@ -187,7 +187,7 @@ class XmlUtils
                 $cast = intval($value);
 
                 return '0' == $value[0] ? octdec($value) : (((string) $raw == (string) $cast) ? $cast : $raw);
-            case '-' === $value[0] && ctype_digit(substr($value, 1)):
+            case isset($value[1]) && '-' === $value[0] && ctype_digit(substr($value, 1)):
                 $raw = $value;
                 $cast = intval($value);