Common module for php are
apt install php7.1-fpm php7.1-common php7.1-mysql php7.1-xml php7.1-xmlrpc php7.1-curl php7.1-gd php7.1-imagick php7.1-cli php7.1-dev php7.1-imap php7.1-mbstring php7.1-soap php7.1-zip php7.1-bcmath -y
To install apache
apt install apache2
Enable mod proxy
sudo a2enmod proxy_fcgi
A virtual host example
<VirtualHost *:80>
ServerName External_IP_Address
DocumentRoot /var/www/html
<Directory /var/www/html>
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>
<FilesMatch ".php$">
SetHandler "proxy:unix:/var/run/php/php7.1-fpm.sock|fcgi://localhost/"
</FilesMatch>
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
