I’ve got a VPS setup with Nginx & PHP5-FPM.
Being fairly new to unix, VPS etc… it took me ages to get the setup I wanted.
However Now I want to be able to install some extensions onto PHP without haveing to rebuild the entire thing. For example. Is there a way to install the php_tidy extension on an existing PHP setup?
You can compile an extensions as a shared library. Then you just have to declare your module in the php.ini.
There is a description at php.net for phpize.
Performance differences between a module and a full compilation are discussed here.