Php 部署Yii2高级模板的Nginx配置

我是使用Nginx的新手，我有一个使用Yii2开发的高级应用程序。我当时正在使用apache server，我的VirtualHost有以下配置：

<VirtualHost *:80>
   DocumentRoot "path/to/cosmox/frontend/web"
   ServerName cosmox.com
   ServerAlias www.cosmox.com
   Alias /admin path/to/cosmox/backend/web
   Alias /uploads path/to/cosmox/backend/web/uploads
   Alias /api path/to/cosmox/api/web

   ErrorLog "logs/cosmox-error.log"
   CustomLog "logs/cosmox-access.log" common

   Options +FollowSymLinks 

所有要下载的新闻海报、游戏海报或文件都可以在backend/web/uploads文件夹中找到，而且服务很好。我的问题是后端和api应用程序

我试过推荐的帖子，比如和其他帖子，但它们对我不起作用

server {
    listen 80;
    #listen [::]:80;

    index index.php;
    error_log /var/log/nginx/cosmox.errors.log;
    access_log /var/log/nginx/cosmox.access.log combined;

    server_name cosmox.com www.cosmox.com;

    #root /path/to/cosmox/backend/web;

    location / {
        root /path/to/cosmox/frontend/web;
        index index.php;
        try_files $uri /index.php$is_args$args;

        location ~ \.php$ {
            include snippets/fastcgi-php.conf;
            fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
        }
    }

    location /admin {
        alias /path/to/cosmox/backend/web;

        index index.php;
        #try_files $uri /index.php$is_args$args;    //This entry break the backend redirect

        location ~ \.php$ {
            include snippets/fastcgi-php.conf;
            fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
            fastcgi_param SCRIPT_FILENAME $request_filename;
            #fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;  //this entry such throw a "File not found" text
       }
    }

    location /api {
        alias /path/to/cosmox/api/web;

        index index.php;
        #try_files $uri /index.php$is_args$args;

        location ~ \.php$ {
            include snippets/fastcgi-php.conf;
            fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
            fastcgi_param SCRIPT_FILENAME $request_filename;
        }
    }

    location /uploads {
        alias /path/to/cosmox/backend/web/uploads;
        try_files $uri $uri;
    }

    location = /favicon.ico {
         try_files /favicon.ico =204;
    }  }