PHP Function

[TheServant]

Hey guys, I am pretty sure this is how it works but I just want to confirm it:
If I declare a function, what's in the function is only run if the function is called? I am planning on having a "function file" which will be called on every page and contain my entire site's functions. The alternative is to include page-specific functions, but if there is no difference then I will just always have all of them there?

[Dormilich]

@TheServant
yes. additionally, there are some magic methods* which are run depending on a condition/event.

@TheServant
that's commonly called a function library.

@TheServant
if you're doing object oriented programming, you can make use of the __autoload() function (resp. spl_autoload_register()). These functions will load only the classes you need.

* __construct(), __destruct(), __get(), __set(), __call(), __sleep(), __wakeup(), __clone(), __autoload() to name maybe the most common.

[TheServant]

lol, I had come across the name function library before, but coudln't remember the phrase. Thanks for your help again ;)

[Markus]

I prefer to call them 'helpers', or rather CodeIgniter would have me call them that.