Description:
------------
unset(array) doesn't free up all the memory. or perhaps setting elements in an array is using up memory that can't be freed. whatever, I dunno how Zend works.

basically, bug 41713 isn't actually fixed.

also it'd be helpful if someone explains why unset() seems to use up ~200B of memory regardless. in a CLI daemon that's a significant memory leak.


Reproduce code:
---------------
<?php
define('LF', chr(10));

$a = null;
echo memory_get_usage().LF;

$a = str_repeat("test", 65536);
echo memory_get_usage().LF;

unset($a);
echo memory_get_usage().LF;

for ($i=0; $i<65536; $i++) { $a[] = "test"; }
echo memory_get_usage().LF;

unset($a);
echo memory_get_usage().LF;

?>


Expected result:
----------------
627560
889944
627776
12163304
62xxxx


Actual result:
--------------
627560
889944
627776
12163304
888744