[WordPress][Nginx] サブディレクトリにサブディレクトリ型のマルチサイトWordPressを設置する際の Nginx 設定

set $proxy_https '';
if ($http_x_forwarded_proto = 'https') { set $proxy_https 'on'; }
if ($http_cloudfront_forwarded_proto = 'https') { set $proxy_https 'on'; }
if ($scheme = 'https') { set $proxy_https 'on'; }

rewrite ^(/[^/]+)/files/$ $1/index.php last;
rewrite ^(/[^/]+)/[_0-9a-zA-Z-]+/files/$ $1/index.php last;

if (!-e $request_filename) {
    rewrite ^(/[^/]+)/[_0-9a-zA-Z-]+/wp-json/.*$ $1/index.php$is_args$args last;
    rewrite ^(/[^/]+)/[_0-9a-zA-Z-]+(/wp-.*)$ $1$2 last;
    rewrite ^(/[^/]+)/[_0-9a-zA-Z-]+(/wp-admin/.*\.php)$ $1$2 last;
    rewrite ^(/[^/]+)/[_0-9a-zA-Z-]+(/.*\.php)$ $1$2 last;
    rewrite ^(/[^/]+)/[_0-9a-zA-Z-]+/?.*$ $1/index.php$is_args$args last;
}

location ~ ^(/[^/]+)/.*$ { try_files $uri $uri/ $1/index.php$is_args$args; }
location / { try_files $uri $uri/ /index.php$is_args$args; }

location ~ \.php$ {
    expires        off;
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_pass   phpfpm;
    fastcgi_index  index.php;
    fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
    fastcgi_param  HTTPS            $proxy_https  if_not_empty;
    fastcgi_param  HTTP_PROXY       "";
    include        fastcgi_params;
    fastcgi_intercept_errors on;
    fastcgi_connect_timeout  60;
    fastcgi_send_timeout     180;
    fastcgi_read_timeout     180;
    fastcgi_buffers          16 16k;
    fastcgi_buffer_size      32k;
    fastcgi_busy_buffers_size 32k;
    fastcgi_temp_file_write_size 256k;
}