作用：把url为：127.0.0.1/index.php/a/b/c 这样处理
把 post参数： /a/b/c到127.0.0.1/index.php
nginx 配置如下：
server {
    listen  80;
    server_name     127.0.0.1;
    root /home/shaddock/Applications/htdocs;
    index index.html index.htm index.php index.js;
    access_log logs/access.log;
    error_log logs/error.log;
    error_page 404  /404.html;
    location /404.html {
root /home/shaddock/Applications/htdocs;
    }
    location /dmp5.0{
index index.html index.htm index.php;
if (-e $request_filename) {
break;
}
if (!-e $request_filename) {
rewrite ^/dmp5.0/(.*)$ /dmp5.0/index.php/$1 last;
break;
}
    }
 
    location ~ .+\.php($|/) {
root/home/shaddock/Applications/htdocs;
fastcgi_index index.php;
fastcgi_split_path_info ^(.+\.php)(.*)$;
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   127.0.0.1:9000;
include        fastcgi_params;
    }
}
错误：
2017/01/09 10:48:58 [error] 5103#0: *57 open() "/home/shaddock/Applications/htdocs/dmp5.0/index.php/index/index/ajaxLogin" failed (20: Not a directory), client: 127.0.0.1, server: 127.0.0.1, request: "POST /dmp5.0/index/index/ajaxLogin HTTP/1.1", host: "127.0.0.1", referrer: "http://127.0.0.1/dmp5.0/"
上面的错误是因为rewrite的时候直接把url http://127.0.0.1/dmp5.0/index.php/index/index/ajaxLogin当成页面处理了。本意应该是
http://127.0.0.1/dmp5.0/index.php/index/index/ajaxLogin这个url把这些单词参数，传给http://127.0.0.1/dmp5.0/index.php
解决：
php中php.ini中下面参数打开
cgi.fix_pathinfo=1

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NGINX 中把url中的内容当初参数处理