> >
> > Would the following be another "usable" solution?
> >
> > <validator class="equals" required="false">
> >  <argument>user_disabled</argument>
> >  <ae:parameter name="value">1</ae:parameter>
> > </validator>
> >
> > $user_disabled = $rd->getParameter('user_disabled', 0); // default  
> > value if not present
> 
> I've been considering that, in most cases it will lead to the same  
> result. However, it will behave differently in a number of edge-cases,  
> most notably that $rd->hasParameter('user_disabled'); will return  
> false, while in the other cases it will return true.
> 

True, implementing the OR solution will be the default for me from now on. :-)

Thanks for the fast response,

Steffen

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