Apache

Install apache2 Debian

$ apt install apache2

List Apache Modules

$ apache2ctl -M
$ apache2ctl -t -D DUMP_MODULES

Install PHP

$ apt install php libapache2-mod-php php-cli 

Enable/disable apache2 php module

$ /sbin/a2enmod phpX.X
$ /sbin/a2dismod phpX.X

Show php version

$ php -v

Start|stop|restart apache2

$ systemctl start apache2 
$ systemctl stop apache2 
$ systemctl restart apache2 

SSL APACHE

$ a2enmod ssl

$ openssl req -new -newkey rsa:4096 -x509 -sha256 -days 365 -nodes -out apache-certificate.crt -keyout apache.key

/etc/apache2/sites-enabled/000-default.conf
<VirtualHost *:443> 
    ServerAdmin webmaster@localhost 
    DocumentRoot /var/www/html 
        ErrorLog ${APACHE_LOG_DIR}/error.log 
        CustomLog ${APACHE_LOG_DIR}/access.log combined 
        SSLEngine on 
        SSLCertificateFile /etc/apache2/certificate/apache-certificate.crt 
        SSLCertificateKeyFile /etc/apache2/certificate/apache.key 
</VirtualHost> 

REDIRECT HTTP

<VirtualHost *:80> 
        RewriteEngine On 
        RewriteCond %{HTTPS} !=on 
        RewriteRule ^/?(.*) https://%{SERVER_NAME}/$1 [R=301,L] 
</virtualhost> 

DISABLE HTTP

 UNCOMMENT IN 000-default.conf
# <VirtualHost *:80>  
#         ServerAdmin webmaster@localhost  
#         DocumentRoot /var/www/html  
#         ErrorLog ${APACHE_LOG_DIR}/error.log  
#         CustomLog ${APACHE_LOG_DIR}/access.log combined  
# </VirtualHost>  

 UNCOMMENT IN ports.conf
# Listen80 

DISABLE/PREVENT from showing/download *.php files if module not loaded

 <IfModule !"php[VERSION]_module">
        <Files "*.php">
               order allow,deny
               Require all denied
        </Files>
 </IfModule>