isset($a->b) even if $a->b = null

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how do i test if a property of a stdclass object is set, even if its
value is null, similar to how array_key_exists() works for arrays.

the following method fails:

  $a->b = null;
  if(isset($a->b))
    echo "yes";

and property_exists() seems only to work for defined objects.

hope someone can help. thanks!

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