NGINX configuration for multi-tenant PHP application

nginx.conf

map $http_accept $api_version {
    default 0;
    "application/vnd.example.v1+json" 1;
}

server {

    listen 80;
    listen [::]:80;

    server_name example.com;
    root /var/www/marketing-app;
    index index.html index.htm;

    location / {
        try_files $uri $uri/ /index.html;
    }

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

server {

    listen 80;
    listen [::]:80;

    server_name ~^(?<tenant>.+)\.example\.com$;
    root /var/www/v$api_version/public;
    index index.php index.html index.htm;

    location / {

        if ($api_version = 0) {
            root /var/www/app/dist;
        }

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

        log_not_found off;

        error_page 404 =200 /index.html;
    }

    location ~ \.php$ {
        try_files $uri /index.php =404;
        fastcgi_pass php-upstream;
        fastcgi_index index.php;
        fastcgi_param TENANT $tenant;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }

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