[Phpwebsite-developers] Include vs. Global

[Dynomite <dyn...@us...>]

I'm curious if anyone has an opinion or knows what is more preferable.   In 
files/functions where the variable for $table_prefix is referenced, do you 
guys think it is better to attach the include to the top of the file with a 
global call to the variable or add the include to each function?   My logic 
is the less global variables used, the better, others?