Added array_undot function

[RyanNielson]

This function converts an array with dotted keys to an associative array. Not sure if it's the best name, but hopefully some of you find the helper useful in some way.

Example:

$array = array('developer.name' => 'John Smith', 'developer.age' => 25, 'developer.address.number' => 123, 'developer.address.street' => 'Fake St');
$undottedArray = array_undot($array);
// $undottedArray is now array('developer' => array('name' => 'John Smith', 'age' => 25, 'address' => array('number' => 123, 'street' => 'Fake St')))

[Anahkiasen]

Proposed and rejected in #4292

[GrahamCampbell]

Better close this then @RyanNielson.

[RyanNielson]

Thanks for the heads up guys, I'll close this. I still think it could be a useful addition, but at least it's in the repos history if we ever want to bring it back from the dead.