Description:
------------
Note: you might say this is a duplicate of #28444, but i don't think it's not a bug so please read carefully what i've written before doing that and if you say it's a duplicate, please explain specificaly why... thanks.
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when i traverse object tree with overloaded properties, i can't assign a value to complex properties (i.e. $a->b->c). i don't see why this should be a problem for php...

I don't get why do you say it's not a bug? Consider my reproduce code.

why do the first and second property accessors work and the third (final) one does not?
as i understand the final statement ($a->a->a = "";) should do:
$a->__get("a")->__set("a", "");

so what's wrong with that? no recursive __get or __set, everything should work by specification... or am i wrong? if so, where?

Reproduce code:
---------------
<?php
class A
{
	function __get($name)
	{
		return new A();
	}
	function __set($name, $value)
	{
	}
}
$a= new A();
$a->a->a; // only __get = ok
$a->a = ""; // only __set = ok
$a->a->a = ""; // __get and __set = error
?>

Expected result:
----------------
the code should work ok.

Actual result:
--------------
Fatal error: Cannot access undefined property for object with overloaded property access in test.php on line 15

this error only happens if php would need to call __get and __set of some classes (sequentially not recursively) to resolve one (lhs) expression.