该版本主要是提升了 PHP 5.3 的稳定性，修复了一些安全漏洞和bug：
- Added "max_file_uploads" INI directive, which can be set to limit the number of file uploads per-request to 20 by default, to prevent possible DOS via temporary file exhaustion.
- Added missing sanity checks around exif processing.
- Fixed a safe_mode bypass in tempnam().
- Fixed a open_basedir bypass in posix_mkfifo().
- Fixed failing safe_mode_include_dir.