由于研究需要，自己搭配个Php5.6和Nginx环境！由于Ubuntu16.04默认Php版本已经升到7.0，因此需要添加5.6版本库才能使用！

安装PHP5.6

sudo add-apt-repository ppa:ondrej/php

sudo apt update

sudo apt install php5.6 php5.6-fpm   //如果只输入php5.6，会安装一大堆东西，包括apache2///

安装Nginx

sudo apt install nginx

配置Nginx

sudo vim /etc/nginx/sites-available/default

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

    # SSL configuration
    #
    # listen 443 ssl default_server;
    # listen [::]:443 ssl default_server;
    #
    # Note: You should disable gzip for SSL traffic.
    # See: https://bugs.debian.org/773332
    #
    # Read up on ssl_ciphers to ensure a secure configuration.
    # See: https://bugs.debian.org/765782
    #
    # Self signed certs generated by the ssl-cert package
    # Don't use them in a production server!
    #
    # include snippets/snakeoil.conf;

    root /var/www/html;

    # Add index.php to the list if you are using PHP
    index index.html index.htm index.nginx-debian.html;

    server_name _;

    location / {
        # First attempt to serve request as file, then
        # as directory, then fall back to displaying a 404.
        try_files $uri $uri/ =404;
    }


    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    location ~ \.php$ {
        fastcgi_split_path_info ^(.+?\.php)(/.+)$;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_pass unix:/run/php/php5.6-fpm.sock;
        fastcgi_index index.php;
        include fastcgi_params;
    }

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    location ~ /\.ht {
        deny all;
    }
}

重启Nginx服务

sudo systemctl restart nginx

测试

在/var/www/html/新建一个info.php并编辑

sudo vim /var/www/html/info.php

<?PHP
phpinfo();
?>

打开浏览器测试！

http://localhost/info.php

搞定！