PHP，是英文超级文本预处理语言Hypertext Preprocessor的缩写。PHP 是一种 HTML 内嵌式的语言，是一种在服务器端执行的嵌入HTML文档的脚本语言，语言的风格有类似于C语言，被广泛的运用。PHP的另一个含义是：菲律宾比索的标准符号。
PHP 独特的语法混合了 C、Java、Perl 以及 PHP 自创新的语法。它可以比 CGI 或者 Perl 更快速的执行动态网页。用PHP做出的动态页面与其他的编程语言相比，PHP是将程序嵌入到HTML文档中去执行，执行效率比完全生成HTML标记的CGI要高许多；PHP还可以执行编译后代码，编译可以达到加密和优化代码运行，使代码运行更快。PHP具有非常强大的功能，所有的CGI的功能PHP都能实现，而且支持几乎所有流行的数据库以及操作系统。
The PHP development team would like to announce the immediate availability of PHP 5.3.5 and 5.2.17.
This release resolves a critical issue, reported as PHP bug #53632 and CVE-2010-4645, where conversions from string to double might cause the PHP interpreter to hang on systems using x87 FPU registers.
The problem is known to only affect x86 32-bit PHP processes, regardless of whether the system hosting PHP is 32-bit or 64-bit. You can test whether your system is affected by running this script from the command line.
All users of PHP are strongly advised to update to these versions immediately.
The PHP development team would like to announce the immediate availability of PHP 5.3.5.
This release resolves a critical issue, reported as PHP bug #53632, where conversions from string to double might cause the PHP interpreter to hang on systems using x87 FPU registers.
The problem is known to only affect x86 32-bit PHP processes, regardless of whether the system hosting PHP is 32-bit or 64-bit. You can test whether your system is affected by running this script from the command line.
All users of PHP are strongly advised to update to these versions immediately.
Security Enhancements and Fixes in PHP 5.3.5:
·Fixed bug #53632 (PHP hangs on numeric ">value 2.2250738585072011e-308). (CVE-2010-4645)
PHP 5.3.5下载地址：
PHP 5.3.5 (tar
.bz2) [10,553Kb] - 06 January 2011
md5: 8aaf20c95e91f25c5b6a591e5d6d61b9 PHP 5.3.5 (tar
.gz) [13,775Kb] - 06 January 2011
md5: fb727a
3ac72bf0ce37e1a20468a7bb81
PHP 5.2.17下载地址：
PHP 5.2.17 (tar.bz2) [8,879Kb] - 06 January 2011
md5: b27947f3045220faf16e4d9158cbfe13 PHP 5.2.17 (tar.gz) [11,525Kb] - 06 January 2011
md5: 04d321d5aeb9d3a051233dbd24220ef1