php 文件被下载怎么办

按下面的配置，配置的 php7.0-fpm 和 nginx ，然后 reload 加载配置，结果发下 www.abc.com/index.php 访问后竟出现下载文件的对话框，而直接访问其他 test.php 可以正常，访问 www.abc.com/也可以正常，哪里需要修改访问 index.php 才能正常，谢谢。

sudo apt-get install php7.0-fpm php7.0-cgi php7.0-common php7.0-curl php7.0-mysql ;

sudo vim /etc/php/7.0/fpm/php.ini,设置 cgi.fix_pathinfo=0

sudo vim /etc/nginx/sites-enabled/www.abc.com

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

    server_name test.app;

    root /var/www/www.abc.com;
    index index.html index.php;

    location / {
            try_files $uri $uri/ =404;
    }

    location ~ \.php$ {
            include snippets/fastcgi-php.conf;

            # With php7.0-cgi alone:
            # fastcgi_pass 127.0.0.1:9000;
            # With php7.0-fpm:
            fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

}