Define disable_functions in ISPConfig scripts/configs
Some of use may use disable_functions in global php.ini files to prevent usage of dangerous functions. This can lead to problems when some of those functions are needed by ISPConfig.
The solution:
in /var/www/php-fcgi-scripts/ispconfig/.php-fcgi-starter add "-d disable_functions=" in /usr/local/ispconfig/server/server.sh add "-d disable_functions="
I think this is important as that way we can use global php.ini to disable functions while this won't affect ISPConfig at all.