I am using Ubuntu 12.04. The default php version is 5.3.10, but I have custom php versions installed and working like 5.4 and 7 Now for the roundcube installation I want to use PHP5.4 or PHP7. Roundcube is installed as vhost in /VAR/www directory. and roundcube.conf is in /etc/apache2/conf.d Where and what changes I can make to enable roundcube to use custom PHP Version.
That's not so easy because roundcube runs with mod_php and the mod_php module is the one of your system PHP. you can e.g. create a new website mail.yourdomain.tld in ISPConfig and install a separate roundcube copy into that site.
