最近研究CI框架，发现这个框架的路由功能在Nginx下有问题，报404错误，后来在网上查资料，
发现需要开启PATH_INFO。在nginx7.16以后貌似就支持PATH_INFO了，只需要在配置文件中开启即可。
打开nginx.conf文件，在你的虚拟主机下增加重写规则，代码如下：
server {
listen 80;
server_name www.ci.com;
location / {
root d:/www/Codeigniter_2.0.1/;
index index.html index.htm index.php;
rewrite ^/$/index.php last;
rewrite^/(?!index\.php|robots\.txt|images|js|styles)(.*)$ /index.php/$1last;
}
location ~^(.+\.php)(.*)$ {
root D:/www/Codeigniter_2.0.1/;
fastcgi_index index.php;
fastcgi_split_path_info ^(.+\.php)(.*)$;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;
fastcgi_pass 127.0.0.1:9002;
include fastcgi_params;
}
}