Description:
------------
The array_splice documentation doesn't warn about the fact that array_splice will change the keys of the original array.  This occurs whenever the spliced in array and removed array are of a different size.

For example in the code below you can see that the key for 'f' has been changed by the array_splice operation.

Reproduce code:
---------------
$a = array('a', 'b', 'c', 'd', 'e', 'f');
Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => d
    [4] => e
    [5] => f
)
array_splice($a, 2, 2, array('g', 'h', 'i'));
Array
(
    [0] => a
    [1] => b
    [2] => g
    [3] => h
    [4] => i
    [5] => e
    [6] => f
)