I'm not sure it is possible or not, but i try
include "http://www.abc.cm.my/function.php"
inside my php file and it not work.
my ideal is
i have a standard function file at my own website and all my clients web will include my standard function directly from my own website, then i no need to duplicate the function file to all my clients website, the trouble i facing now is, i need to change/update the function file at each/all of my clients website, it not hard but just many work to do.
hope you guys understand my situation and my English.