Variable variable class extensions in PHP--is it possible?

Question

Is something like the following possible in PHP?

$blah = \'foo1\';

class foo2 extends $blah {
    //...
}

class foo1 {
    //...
}

This g

Answer 1

If you don't have too many values for $blah, you could extend each one in a different file then require_once "classes/foo_$blah.php"

Otherwise, you're stuck with the eval() solution... good luck with that... :)