assigning to $this in constructor

I think I was once able to assign to the $this reference in the
constructor of a php class. I don't seem to be able to do this anymore.
Is this new in 4.3?

Is there anyway to alter what object is returned from a php class
constructor? 

For instance, there might have been an error so you would return an
error object instead of the requested object.

Thanks,

Matt Friedman


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