PHP是一种新型的CGI程序编写语言,易学易用,运行速度快,可以方便快捷地编写出功能强大,运行速度快,并可同时运行于 Windows、Unix、Linux平台的Web后台程序, 内置了对文件上传、密码认证、Cookies操作、邮件收发、动态GIF生成等功能,PHP 直接为很多数据库提供原本的连接,包括Oracle、Sybase、Postgres、Mysql、Informix、Dbase、Solid、 Access等,完全支持ODBC接口,用户更换平台时,无需变换PHP代码,可即拿即用.

http://cn.php.net/distributions/php-5.2.12.tar.bz2 (源码)
http://cn.php.net/distributions/php-5.2.12-Win32.zip (win 二进制包)

查看ChangeLog: http://www.php.net/ChangeLog-5.php#5.2.12

Security Enhancements and Fixes in PHP 5.2.12:

• Fixed a safe_mode bypass in tempnam() identified by Grzegorz Stachowiak. (CVE-2009-3557, Rasmus)
• Fixed a open_basedir bypass in posix_mkfifo() identified by Grzegorz Stachowiak. (CVE-2009-3558, Rasmus)
• 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, identified by Bogdan Calin. (CVE-2009-4017, Ilia)
• Added protection for $_SESSION from interrupt corruption and improved "session.save_path" check, identified by Stefan Esser. (CVE-2009-4143, Stas)
• Fixed bug #49785 (insufficient input string validation of htmlspecialchars()). (CVE-2009-4142, Moriyoshi, hello at iwamot dot com)