Description:
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Using variables to reference object properties doesn't work in certain cases.

Test script:
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$obj = new stdClass();
$obj->bar = "xyz";
$data = array("foo" => "bar");
$key = "foo";
echo $obj->$data[$key];
$member = $data[$key];
echo $obj->$member;

Expected result:
----------------
xyzxyz

Actual result:
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Notice: Array to string conversion in Command line code on line 1

Notice: Undefined property: stdClass::$Array in Command line code on line 1
xyz