PHP 5.2.1
PHP 开发团队已经于早些时候宣布了 PHP 5.2.1 可用的消息，据悉，本次发布主要是增强了 5.x 分支的稳定性和安全性。PHP 官方建议使用者升级到最新版。
在 PHP 5.2.1 发布公告中所列出的安全增强和修正有：
* Fixed a possible safemode & openbasedir bypasses inside the session extension. * Prevent search engine from indexing the phpinfo() page. * Fixed a number of input processing bugs inside the filter extension. * Fixed unserialize() abuse on 64 bit systems with certain input strings. * Fixed possible overflows and stack corruptions in the session extension. * Fixed an underflow inside the internal sapiheaderop() function. * Fixed allocation bugs caused by attempts to allocate negative values in some code paths. * Fixed possible stack overflows inside zip, imap & sqlite extensions. * Fixed several possible buffer overflows inside the stream filters. * Fixed non-validated resource destruction inside the shmop extension. * Fixed a possible overflow in the strreplace() function. * Fixed possible clobbering of super-globals in several code paths. * Fixed a possible information disclosure inside the wddx extension. * Fixed a possible string format vulnerability in *print() functions on 64 bit systems. * Fixed a possible buffer overflow inside mail() and ibase{delete,add,modify}user() functions. * Fixed a string format vulnerability inside the odbcresultall() function. * Memory limit is now enabled by default. * Added internal heap protection. * Extended filter extension support for $SERVER IN cgi AND apache2 SAPIs.
你可以从下面的链接下载到 PHP 的最新版，其中包括完整的源码包和用于 Windows 平台的二进制包。
Download PHP 5.2.1
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