Convert flat array of delimited strings (filepaths) to a hierarchical, associative multidimensional array

I have a collection of keys in this massive flat single array I would like to basically expand that array into a multidimensional one organized by keys - here is an example:

Input:

[
    'invoice/products/data/item1',
    'invoice/products/data/item2',
    'invoice/products/data/item2',
]

Desired result:

[
    'invoice' => [
        'products' => ['item1', 'item2', 'item3']
    ]
]

How can I do this?

The length of the above strings are variable.

Something along these lines: (Didn't test it though!) Works now ;)

$data = array();
$current = &$data;
foreach($keys as $value) {
  $parts = explode("/", $value);
  $parts_count = count($parts);
  foreach($parts as $i => $part) {
    if(!array_key_exists($part, $current)) {
      if($i == $parts_count - 1) {
        $current[] = $part;
      }
      else {
        $current[$part] = array();
        $current = &$current[$part];
      }
    }
    else {
      $current = &$current[$part];
    }
  }
  $current = &$data;
}

$keys beeing the flat array.