<；Nginx>；如何设置多动态虚拟主机+www+子域

关于nginx虚拟主机和子域配置存在一些问题，但它无法实现。

我有一个3域和一个IP地址（多站点）

www.a1.com
www.a2.com
www.a3.com

我想使用一个简单的nginx配置来设置它，当我进入时

URL重写

a1.com      => force redirect non-www to WWW url www.a1.com
www.a1.com      => pass to /usr/share/nginx/html/a1.com/
www.blog.a1.com => pass to /usr/share/nginx/html/a1.com/blog/
*www.photo*.a1.com=> pass to /usr/share/nginx/html/a1.com/*photo*/
...and so on
a2.com      => force redirect non-www to WWW url www.a2.com
www.a2.com      => pass to /usr/share/nginx/html/a2.com/
www.blog.a2.com => pass to /usr/share/nginx/html/a2.com/blog/
www.photo.a2.com=> pass to /usr/share/nginx/html/a2.com/photo/
www.user.a2.com=> pass to /usr/share/nginx/html/a2.com/user/
...and so on

a1、a2和a3.com使用相同的配置。

这是我的第一个代码，我该如何修复它？

伪代码

if subdomain lacks 'www' then pass to $scheme://www.$host$request_uri;
if subdmain <>'' then pass to /usr/share/nginx/html/$host/<#subdmain#>/$request_uri;

/etc/nginx/conf.d/default.conf

server {
    # Redirect non-www to WWW
    server_name "~^(?!www'.).*" ;
    return 301 $scheme://www.$host$request_uri;
}
server {
    listen 80 default;
    #automatic judging hostname
    server_name  ~^(www'.)?(?<domain>.+)$;
    location / {
        #automatic change folder
        root    /usr/share/nginx/html/$domain/;
        index index.html index.php;
        #try_files $uri $uri/ /index.php?$query_string;
    }
    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    location ~ '.php$ {
        fastcgi_pass   127.0.0.1:9000;
        fastcgi_index  index.php;
        # judging subdomain which have "www"
        if ($subdomain = 'www') {
            fastcgi_param SCRIPT_FILENAME /usr/share/nginx/html/$domain$fastcgi_script_name;
        }
        # judging subdomain like "blog" and trans to blog folder
        else {
            fastcgi_param SCRIPT_FILENAME /usr/share/nginx/html/$domain/$subdomain/$fastcgi_script_name;
        }
        include    fastcgi_params;
    }
}