Posted by Jiri Fogl on 11/18/71 11:44

> What's the actual difference between a function and a macro? How would use
> of macros differ from functions?

I was working on modular system, where every module was a file with
object definition.

I needed to make some global variables accessible in method of this
object (i.e. database connection object) in every module, but I wanted
to have a list of these variables only once in whole system (it would be
unpleasant to edit all modules if I decided to, for example, change name
of any of these variables).

Function is useless in this case, so I needed a macro.

I solved a problem this way:

// In initialisation part of code
define('MY_MACRO', 'global $database, $global_config,
$any_other_needed_variables;');

// In beginning of module object's method
eval (MY_MACRO);

But maybe there is much better way to do this

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