最近公司在搞lumen 框架，需要用到一个场景。

就是
XXX.com/apiv1/controller/action
XXX.com/apiv2/controller/action
XXX.com/apiv3/controller/action
以此类推

由于lumen 比较坑，必须用项目下的public 为 server_root.

本来我们有一个很懒的解决方案就是用无限的子域名堆出无限个的virtualhost.
apiv1.XXX.com/controller/action
apiv2.XXX.com/controller/action
apiv3.XXX.com/controller/action

不过后来想到域名生效、域名子域名数量限制等问题，就放弃了。

老老实实搞nginx 配置。

经过半天的折腾，完美解决。
nginx 配置如下：

server {
    listen       80;
    server_name  haha.17ping.cn;
    root         /data/www/sdkHoster;

    location / {
        index    index.php index.htm index.html;
        autoindex on;
    }

    location /sdk1 {
        root    /data/www/sdkHoster;
        index   index.php index.htm index.html;
        try_files $uri $uri/ /sdk1/public/index.php?$query_string;
    }

    location /sdk2 {
        root    /data/www/sdkHoster;
        index   index.php index.htm index.html;
        try_files $uri $uri/ /sdk2/public/index.php?$query_string;
    }

    location ~ \.php$ {
        set $newurl $request_uri;
        if ($newurl ~ ^/sdk(\d+)(.*)$) {
                set $newurl $2;
        }
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
        #fastcgi_pass   127.0.0.1:9000;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root/$fastcgi_script_name;
        include        fastcgi_params;
        fastcgi_param REQUEST_URI $newurl;
    }

    location ~ \.(css|js|swf|php|htm|html)$ {
        add_header Cache-Control no-store;
    }

    location ~ /\.ht {
        deny  all;
    }
}

效果如下：

root@iZuf6c8x9fhxje4raqhanuZ:/data/www/sdkHoster# curl -X POST http://haha.17ping.cn/sdk1/account/index
{"code":0,"message":"OK","data":{"msg":"\u5982\u9047\u8d26\u53f7\u95ee\u9898\u8bf7\u8054\u7cfbQQ:115693753"}}

root@iZuf6c8x9fhxje4raqhanuZ:/data/www/sdkHoster# curl -X POST http://haha.17ping.cn/sdk2/account/index
{"code":0,"message":"OK","data":{"msg":"\u5982\u9047\u8d26\u53f7\u95ee\u9898\u8bf7\u8054\u7cfbQQ:115693753"}}
root@iZuf6c8x9fhxje4raqhanuZ:/data/www/sdkHoster#

不过这个配置有个缺点，就是如果url后面不跟任何东西的话，比如(http://haha.17ping.cn/sdk2) 就会找不到index.php.
一般这种页面 lumen 是用来打印版本信息的。

如果有人觉得强迫症不爽的话，直接从public 下面复制一个 index.php 到 上一级目录，然后修改14行的

$app = require __DIR__.'/../bootstrap/app.php';
改成
$app = require __DIR__.'/./bootstrap/app.php';

把导入的相对路径调成平级就行了。效果如下：

root@iZuf6c8x9fhxje4raqhanuZ:/data/www/sdkHoster# curl -X GET http://haha.17ping.cn/sdk1/
Lumen (5.5.2) (Laravel Components 5.5.*)
root@iZuf6c8x9fhxje4raqhanuZ:/data/www/sdkHoster# curl -X GET http://haha.17ping.cn/sdk2/
Lumen (5.5.2) (Laravel Components 5.5.*)
root@iZuf6c8x9fhxje4raqhanuZ:/data/www/sdkHoster#

注：本文撰写实践时参考了一下链接：
https://stackoverflow.com/questions/37366484/is-it-possible-to-install-lumen-or-laravel-only-in-a-sub-directory
https://stackoverflow.com/questions/32186105/lumen-multisite-using-subdirectories-on-nginx
https://stackoverflow.com/questions/17805576/nginx-rewrite-in-subfolder
https://laracasts.com/discuss/channels/general-discussion/nginx-setup-for-subdirectory
https://gist.github.com/mreschke/27bfafb84add38d3bab8
https://stackoverflow.com/questions/45378367/lumen-application-workwith-trailing-slash-using-nginx-server
https://stackoverflow.com/questions/34823913/lumen-in-a-subfolder-trailing-slashes-issue