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！