Merge branch 'PHP-5.4' of https://git.php.net/push/php-src into PHP-5.4
mb_split() can now handle empty matches like preg_split() does.
update NEWS
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  update NEWS
  mb_split() can now handle empty matches like preg_split() does.