The following piece of code is not compatible with the current behaviour since PHP 3.0.x (I don't remember exactly, I wasn't counting) :

class toto {
  var $meuuh;
  function toto() { $this->meuuh = 1; }
}
class titi extends toto {
}
$titi = new titi;
echo "the result is : ".$titi->meuuh;