overloading PHP

Hello,
I had a question concerning overloading in PHP, which is not possible.
Is there an elegant way to do this? I read s.th. about using the factory pattern with a private constructor.

The background is this, I have a User class and I want to differentiate between the current user, with no constructor-parameter (I fetch the id from the session) and with an other user, with one parameter: __construct($id)?

Thanks, iago

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