Question

Can you turn this string:

"package.deal.category"

Into an array like this:

$array['package']['deal']['category']

The value inside the index at this point can be anything.

Answer 1

What have you tried? The absolute answer to this is very easy:

$keys = explode('.', $string);
$array = array();
$arr = &$array;
foreach ($keys as $key) {
   $arr[$key] = array();
   $arr = &$arr[$key];
}
unset($arr);

…but why would this be useful to you?