Description:
------------
When you call array_pop on an array, you only get back the 
value. It would be nice if there was an array_key_value_pop 
function that returned both the key and the value.

Reproduce code:
---------------
function array_key_value_pop (&$a) {
    end($a);
    $lastItem = each($a);
    array_pop($a);

    return array($lastItem["key"] => $lastItem["value"]);
}



Expected result:
----------------
$a = array ("red"=>"12a", "fish" => "rock", "blue" => "xyz");
print_r (array_key_value_pop($a));

Array
(
    [blue] => xyz
)

print_r($a);

Array
(
    [red] => 12a
    [fish] => rock
)


Actual result:
--------------
n/a