Plugin system: Automatically instantiate included classes?

Hi there,

I am planning to implement a plugin system, based on the observer
pattern in some way, but now I am stuck with the instantiation of the
plugins.

I want the plugins to have their own class, abstracted from the class
Plugin. So far its nothing new. But how could I possibly automate the
instantiation of the included plugin, without knowing it/hardcoding
it? I'd like to have an array of activated plugins and based on this I
have to instantiate them to give them to the observed object. But I
dont know how to instantiate a class just by its name in a variable
without using eval() or something (dont like eval()).

Does anybody know how to solve this?

Best regards,

Arne

On 19 Mai, 20:58, Michael Fesser wrote:
> .oO(Arne-Kolja Bachstein)
>
> >I am planning to implement a plugin system, based on the observer
> >pattern in some way, but now I am stuck with the instantiation of the
> >plugins.
>
> >I want the plugins to have their own class, abstracted from the class
> >Plugin. So far its nothing new. But how could I possibly automate the
> >instantiation of the included plugin, without knowing it/hardcoding
> >it? I'd like to have an array of activated plugins and based on this I
> >have to instantiate them to give them to the observed object. But I
> >dont know how to instantiate a class just by its name in a variable
> >without using eval() or something (dont like eval()).
>
> >Does anybody know how to solve this?
>
> $foo = 'yourClass';
> $bar = new $foo();
>
> Micha

that does work? i'm embarrassed thank you