diff --git a/Classes/PHPExcel/Settings.php b/Classes/PHPExcel/Settings.php
index eff33f0..dcbc89f 100644
--- a/Classes/PHPExcel/Settings.php
+++ b/Classes/PHPExcel/Settings.php
@@ -353,34 +353,36 @@ class PHPExcel_Settings
     }
 
     /**
-     * Set default options for libxml loader
+     * Set options for libxml loader
      *
-     * @param int $options Default options for libxml loader
+     * @param   int   $options   Options for libxml loader
      */
     public static function setLibXmlLoaderOptions($options = null)
     {
-        if (is_null($options) && defined(LIBXML_DTDLOAD)) {
+        if (is_null($options) && defined('LIBXML_DTDLOAD')) {
             $options = LIBXML_DTDLOAD | LIBXML_DTDATTR;
         }
         if (version_compare(PHP_VERSION, '5.2.11') >= 0) {
-            @libxml_disable_entity_loader($options == (LIBXML_DTDLOAD | LIBXML_DTDATTR));
+            @libxml_disable_entity_loader((bool) $options);
         }
         self::$libXmlLoaderOptions = $options;
     }
 
     /**
-     * Get default options for libxml loader.
+     * Get defined options for libxml loader.
      * Defaults to LIBXML_DTDLOAD | LIBXML_DTDATTR when not set explicitly.
      *
      * @return int Default options for libxml loader
      */
     public static function getLibXmlLoaderOptions()
     {
-        if (is_null(self::$libXmlLoaderOptions) && defined(LIBXML_DTDLOAD)) {
+        if (is_null(self::$libXmlLoaderOptions) && defined('LIBXML_DTDLOAD')) {
             self::setLibXmlLoaderOptions(LIBXML_DTDLOAD | LIBXML_DTDATTR);
+        } elseif (is_null(self::$libXmlLoaderOptions)) {
+            self::$libXmlLoaderOptions = true;
         }
         if (version_compare(PHP_VERSION, '5.2.11') >= 0) {
-            @libxml_disable_entity_loader(self::$libXmlLoaderOptions == (LIBXML_DTDLOAD | LIBXML_DTDATTR));
+            @libxml_disable_entity_loader((bool) self::$libXmlLoaderOptions);
         }
         return self::$libXmlLoaderOptions;
     }
diff --git a/Examples/01simple.php b/Examples/01simple.php
index e9671be..4644a46 100644
--- a/Examples/01simple.php
+++ b/Examples/01simple.php
@@ -37,6 +37,12 @@ define('EOL',(PHP_SAPI == 'cli') ? PHP_EOL : '<br />');
 require_once dirname(__FILE__) . '/../Classes/PHPExcel.php';
 
 
+
+$count = 39;
+$columnLetter = PHPExcel_Cell::stringFromColumnIndex($count); 
+
+var_dump($columnLetter);
+die();
 // Create new PHPExcel object
 echo date('H:i:s') , " Create new PHPExcel object" , EOL;
 $objPHPExcel = new PHPExcel();
diff --git a/unitTests/Classes/PHPExcel/SettingsTest.php b/unitTests/Classes/PHPExcel/SettingsTest.php
new file mode 100644
index 0000000..0618c78
--- /dev/null
+++ b/unitTests/Classes/PHPExcel/SettingsTest.php
@@ -0,0 +1,32 @@
+<?php
+
+
+class SettingsTest extends PHPUnit_Framework_TestCase
+{
+
+    public function setUp()
+    {
+        if (!defined('PHPEXCEL_ROOT')) {
+            define('PHPEXCEL_ROOT', APPLICATION_PATH . '/');
+        }
+        require_once(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
+    }
+
+    /**
+     */
+    public function testGetXMLSettings()
+    {
+        $result = call_user_func(array('PHPExcel_Settings','getLibXmlLoaderOptions'));
+        $this->assertTrue((bool) ((LIBXML_DTDLOAD | LIBXML_DTDATTR) & $result));
+    }
+
+    /**
+     */
+    public function testSetXMLSettings()
+    {
+        call_user_func_array(array('PHPExcel_Settings','setLibXmlLoaderOptions'), [LIBXML_DTDLOAD | LIBXML_DTDATTR | LIBXML_DTDVALID]);
+        $result = call_user_func(array('PHPExcel_Settings','getLibXmlLoaderOptions'));
+        $this->assertTrue((bool) ((LIBXML_DTDLOAD | LIBXML_DTDATTR | LIBXML_DTDVALID) & $result));
+    }
+
+}