Fix code style

src/Spout/Reader/XLSX/Helper/DateFormatHelper.php

@@ -5,8 +5,6 @@ namespace Box\Spout\Reader\XLSX\Helper;
 /**
  * Class DateFormatHelper
  * This class provides helper functions to format Excel dates
- *
- * @package Box\Spout\Reader\XLSX\Helper
  */
 class DateFormatHelper
 {
@@ -104,9 +102,10 @@ class DateFormatHelper
         // Finally, to have the date format compatible with the DateTime::format() function, we need to escape
         // all characters that are inside double quotes (and double quotes must be removed).
         // For instance, ["Day " dd] should become [\D\a\y\ dd]
-        $phpDateFormat = preg_replace_callback('/"(.+?)"/', function($matches) {
+        $phpDateFormat = preg_replace_callback('/"(.+?)"/', function ($matches) {
             $stringToEscape = $matches[1];
             $letters = preg_split('//u', $stringToEscape, -1, PREG_SPLIT_NO_EMPTY);
+
             return '\\' . implode('\\', $letters);
         }, $phpDateFormat);