add-apt-repository ppa:ondrej/php
apt-get update
apt-get install libapache2-mod-fastcgi php5.6-fpm php5.6 php5.6-mcrypt php5.6-mbstring php5.6-mysql php5.6-zip php5.6-gd php5.6-xml php7.0-fpm libapache2-mod-fastcgi php7.0-fpm php7.0 php7.0-mcrypt php7.0-mbstring php7.0-mysql php7.0-zip php7.0-gd php7.0-xml

a2enmod actions
a2enmod fastcgi

vi /etc/apache2/conf.d/php-fpm.conf

<IfModule mod_fastcgi.c> 
#  AddHandler php56-fcgi .php
   Action php56-fcgi /php56-fcgi
   Alias /php56-fcgi /usr/lib/cgi-bin/php56-fcgi
   FastCgiExternalServer /usr/lib/cgi-bin/php56-fcgi -socket /var/run/php/php5.6-fpm.sock -pass-header Authorization
   Action php70-fcgi /php70-fcgi
   Alias /php70-fcgi /usr/lib/cgi-bin/php70-fcgi
   FastCgiExternalServer /usr/lib/cgi-bin/php70-fcgi -socket /var/run/php/php7.0-fpm.sock -pass-header Authorization
</IfModule>
<Directory /usr/lib/cgi-bin>
   Order allow,deny
    Allow from all
</Directory>

vi /etc/apache2/mods-available/php5.conf

 SetHandler application/x-httpd-php
SetHandler application/x-httpd-php-source

auskommentieren

service apache2 restart

nun kann in der .htaccess die gewünschte php Version aktiviert werden

AddHandler php70-fcgi .php

oder

AddHandler php56-fcgi .php