Change Object Type

[marc serra <mserra@xxxxxxxx>]

hi,
i'm looking for a solution to change the object's class.

i got a class and a derived class like this: (just for example, 
completly stupid ^^)

class Ex{
   var a;
   var b;
}

class Ex2 extends Ex{
   var c;
}

i want to create an object Ex and after change the object class to Ex2 
to complete him like this:
$ex = new Ex();
$ex->a = 1;
$ex->b = 2;

$ex2 = (Ex2)$ex;      /// here i want to convert object Ex to object Ex2
$ex2->c = 5;

Can someone help me? I know it's possible to do this in JAVA but it is 
possible to do the same in PHP ?

thx in advance,
Marc.

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