As Juan cannot answer you today, I will do instead.
You are right about modularity. If you execute the following command you will get the default location and additional folder for php ini files:
Apart from that, if using a Bitnami Stack, it is recommended to follow guides and get software from source instead of using
apt-get as as Juan mentioned this will install software system wide and won't be able to detect Bitnami installation and problems may raise.
Hope this information helps.
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