nginx try_文件未分析php文件

由于历史原因，我的项目被分为三个项目

这使得nginx配置文件非常难以处理，以至于我尝试了许多解决方案，但仍然没有完美地解决它

目录配置：

• /var/www/html/：项目目录
• /mnt/a.com/：另一个项目目录
• 第三个项目使用反向代理

配置文件如下所示：

server {
    listen   80;
    listen   [::]:80 default ipv6only=on;

    server_name _;
    root  /var/www/html;
    index index.html index.htm index.php;

    sendfile off;

    location / {
        try_files $uri $uri/index.html $uri/index.htm $uri/index.php @mnt;
        # try_files $uri $uri/ @mnt;
        # This annotated code causes a 403 error to be returned when accessing an empty directory instead of redirecting to @mnt

    }

    location @mnt {
        root /mnt/a.com;
        try_files $uri $uri/index.html $uri/index.htm $uri/index.php @proxy;
    }

    location @proxy {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://a-proxy.com;
    }


    location ~ \.php$ {
        try_files $uri @mntphp;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param SCRIPT_NAME $fastcgi_script_name;
        fastcgi_index index.php;
        include fastcgi_params;
    }

    location @mntphp {
        root /mnt/a.com;
        try_files $uri @proxy;

        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param SCRIPT_NAME $fastcgi_script_name;
        fastcgi_index index.php;
        include fastcgi_params;
    }

    # deny access to . files, for security
    location ~ /\. {
        log_not_found off;
        deny all;
    }

    location ~* \.(jpg|jpeg|gif|png|css|js|ico|webp|tiff|ttf|svg)$ {
        expires 2d;
    }

    error_log   /var/log/a.com_error.log;
    access_log  /var/log/a.com.log;
}

但是这样的配置将导致php文件无法解析。我知道这是因为try_文件将只重定向最后一个参数，但我不知道如何解决这个问题