array_pop() with key-value pair ???

Hi, Why isn't there a function that acts like array_pop() returns a pair of key-value rather than the value only ? Reason is, that in order to pop the key-value pair, you do: <?php $arr = array('a'=>1,'b'=>2,'c'=>3,'d'=>4); $arr_keys = array_keys($arr); $key = array_pop($arr_keys); $value = $arr[$key]; ?> I benchmarked array_keys() function and it is very slow on big arrays since PHP has to build the array. While array_pop() can be acceleraed by the guts of PHP engine. -thanks