Description:
------------
---
From manual page: http://www.php.net/function.empty
---
5.5.0	
empty() now supports expressions, rather than only variables.
---

The `empty()` can't evaluate multiple `__get()` results explicitly.

It seems that instead of correct nesting which is left to right nesting:
empty(...(((($this)->a)->b)->c)->...)
It uses a right to left nesting:
empty(($this->(a->(b->(c)->...)))...)
Which returns `null` at the first left-most `->` operator, yielding to an empty call to become true.

Test script:
---------------
<?php
class Juice extends Liquid{
   protected $apple;
   protected $orange;
   public function __get($name) {
      return $this->$name;
   }
   public function __construct($apple, $orange) {
      $this->apple = $apple;
      $this->orange = $orange;
   }
}

class Glass {
   protected $liquid;
   public function __get($name) {
      return $name == "liquid" ? $this->liquid : false;
   }
   public function __construct() {
      $this->juice = new Juice(3, 5);
   }
}

$glass = new Glass();
var_dump(empty($this->liquid));
var_dump(empty($this->liquid->apple));
var_dump(empty(($this->liquid->apple)));

?>

Expected result:
----------------
bool(false)
bool(false)
bool(false)

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