Azure网站上的PHP ? 架构
Azure是一个开放而灵活的平台。您可以选择最适合或者最擅长的语言（包括 ASP.NET、PHP、Node.js、Python 和经典 ASP）创建基于Azure网站的应用程序。在随后的几篇文章中，我们将讨论Azure网站上的PHP。
首先，我们讨论Azure网站上PHP的架构。
下图描述了Windows Azure网站上PHP的架构。该架构与本地IIS上的PHP配置并无不同。
PHP请求的处理流程如下：
1. 客户端HTTP请求到达HTTP.SYS（处理HTTP请求的内核模块）
2. HTTP请求被转发到网站的工作进程W3WP.EXE
3. IIS FASTCGI模块负责处理PHP请求。
4. 根据具体情况，FASTCGI模块启动一个新的PHP-CGI.EXE，然后将请求转发到新的PHP-CGI.EXE；或者将请求转发到一个现有的PHP-CGI.EXE。FASTCGI与PHP-CGI.EXE之间的通信采用命名管道。
5. PHP-CGI.EXE处理PHP请求，将结果返回给FASTCGI模块
6. 最终响应通过HTTP.SYS发回客户端。
在Azure网站上部署PHP时，您需要注意下面的事项：
1. Azure网站默认启用PHP，如果不需要PHP可以通过管理门户网站关闭PHP功能。
2. Azure网站不允许客户修改PHP的系统级别设置。
3. Azure网站目前支持PHP 5.3，5.4，5.5版本，我们会在后续的文章中讨论如何配置其它版本。
4. Azure网站目前只支持32位PHP。在管理门户网站将网站设置为64位模式，只是将W3WP.EXE设置为64位。PHP-CGI.exe仍然是32位。
5. PHP-CGI.EXE的实例数目由FASTCGI模块根据负载和机器资源情况自动决定。
下一篇文章我们将讨论如何配置Azure网站上的PHP。
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