Ok, Thank you for your help Miguel and Maxim, I'm trying to do it by 
the help of your suggestions.


> > >Also, you can find out if a class was defined by calling
> > >'class_exists()'. In this way you might save something.
> > >The best way thought is what Miguel was saying: load the files
> > >conditionally with a logic.
> >
> > That's what I'm trying to do, but still searching for the logic.
> > But as I see, there's no better way of doing this other than
> > checking if the needed classes are defined before every
> > instantiation.
> Perhaps you can conjure up some sort of namespace scheme, and then
> use a global array to track which class files have been loaded, or
> which classes have been instantiated, or whatever it is you need to
> keep track of.
> In your file with a dependency:
>   global $LOAD_STATUS;
>   if (!$LOAD_STATUS['classes-db-queryops'])
>      include 'lib/classes/db/queryops.php';
> In lib/classes/db/queryops.php:
>   global $LOAD_STATUS;
>   $LOAD_STATUS['class-db-queryops'] = 1;
> Seems fairly cheap to do.
> miguel

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