Posted by Marco Schuler on 02/01/05 17:26

Am Dienstag, 1. Februar 2005 16:07 schrieb Marco Schuler:
> Am Dienstag, 1. Februar 2005 15:50 schrieb Jochem Maas:
> > Marco Schuler wrote:
> > > Hi
> > >
> > > I found a function declaration in an open source project (in
> > > php5) and I could not find documantation for this. The function
> > > declaration is:
> > >
> > > public function registerComp(IComp $comp)
> > >
> > > Is it a kind of typecast?
> >
> > no its a type declaration (is that the correct term). it states
> > that $comp must be an object of class IComp (or a subclass of
> > it). if $comp is not anj IComp object you get a fatal error.

Found it out: It is called "Type Hinting".

http://ch2.php.net/manual/en/language.oop5.typehinting.php

There is a user contributed note on that page:
"Type hinting allows not to specify a required interface to be
supported for the object being passed. Beware, the interpreter will
not give an error for that."

Is it a bug in php or what is the reason?

--
Cheers!

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