for users trying to set up a test server of yourself. some php modules might not be installed nor specified on the official wiki. i have a guide for a OpenBSD install here that might help or be it as a check list to get a environment set up.

the php modules you will need is php-mysqli and php-gd
php-mysqli is to run code thu mysql
php-gd is for image processing. mainly to get thumbnails.

common mistake i had is all files should be owned by the web server user and dat should be 777 or writable from web server user.