Description:
------------
Currently, it is impossible to force destruct/delete/destroy an object or any variable for that matter. Instead, you must unset all references until ref_count is at 0, at which point the variable/object is destructed/removed from memory.

This works is fine as long as you know where all references are, but not if you don't. And this can happen e.g: when you're a lib developer and have to destruct something that the developer might reference several times, or if you're using a Singleton with a "destroy" method.

Therefore, I propose a new language construct called "delete" (or some other fancy name), which deletes the variable immediately with all it's references and calling destructor if object & available.

Having both unset & delete at your disposal would give you great freedom, both are useful for different situations.

Test script:
---------------
See: http://pastebin.com/pGdsed5M

Note: as long as variables are in the same scope, all will be nulled with:
<?php
$a = 1;
$b =& $a;
$c =& $a;

$a = null;
?>
But this does not satisfy situations where references may be spread over many scopes.

"pseudocode" of what delete($x) should do:

$referencing_x = get_references_to($x);
foreach($referencing_x as $ref)
{
   $ref = null;
}

unset($x);

Expected result:
----------------
With "delete" keyword implemented:
----------------------------------
A destructed

Notice:  Undefined variable: a in D:\Programming\UV\public\TEST\delete.php on line 48

NULL
NULL
NULL

Actual result:
--------------
With unset:
-----------
Notice:  Undefined variable: a in D:\Programming\UV\public\TEST\delete.php on line 52

NULL
object(A)#30 (0) {
}
object(A)#30 (0) {
}

A destructed