+ You can now use array_insert() on multi-dimensional arrays. I'm pretty happy with that one, as it only cost me 250 more bytes of PHP, and no extra functions. I'm sure someone else wrote a one-liner to do the same at some point, but I haven't found it, so you're stuck with my algorithm. (Subs.php)

@ For instance: array_insert(array('hello' => 'world', 'sub' => array('multi' => array('foobar' => false))), 'sub>multi>foobar', $my_array) should add $my_array right before the 'foobar' entry. Patent pending.