Description:
------------
If you use a language construct ej: empty on a object and want to call a magic function ej: __get, the function is not called and the function fails.

Reproduce code:
---------------
class Test {
     public $input;

     public function __construct() {
          $this->input = array( "foo" => "bar" );
     }

     public function __get( $var ) {
         return $this->input[$var];
     }
}

$test = new Test();
if( empty( $test->foo ) ) {
     echo "Foo on Test is empty";
} else {
     echo "Foo on Test is not empty";
}

Expected result:
----------------
Foo on Test is not empty.

Actual result:
--------------
Foo on Test is empty