PHP configuration under Debian and Ubuntu should go to /etc/php5/conf.d/30-cartulary.ini

[ivucica]

It might be better and more compatible with system updates later on if the automated installer would place the configuration changes into /etc/php5/conf.d/30-cartulary.ini under Debian and Ubuntu systems.

This is the location where various Debian and Ubuntu packages (and third party software) can place their 'patches' for php.ini files.

Or, more precisely, the configuration itself should go to /etc/php5/mods-available/cartulary.ini, then being symlinked into /etc/php5/conf.d/30-cartulary.ini.