Description:
------------
If you try to check the existence of a property on an array, suprisingly you wont get any error or notice, but you will get the results as you were checking with the correct type.

Reproduce code:
---------------
<?php
$a = array('foo' => 'bar');
echo "<pre>";var_dump(isset($a->foo));echo "</pre>";
echo "<pre>";var_dump(isset($a->asd));echo "</pre>";
echo "<pre>";var_dump(empty($a->foo));echo "</pre>";
echo "<pre>";var_dump(empty($a->asd));echo "</pre>";
echo "<pre>";var_dump(@$a->foo);echo "</pre>";


Expected result:
----------------
Fatal error:  Cannot use array as object in ...

OR

bool(false)

bool(false)

bool(true)

bool(true)

NULL


Actual result:
--------------
bool(true)

bool(false)

bool(false)

bool(true)

NULL