Often times I find myself wanting to push something to an array (if the array exists), or initialize it to an empty array and then push it (if the array doesn't exist yet). For example:

if ($this->hasChanges($data)) {
  Arr::push($result, 'pending.changes', $data);
}

In this case, if $result['pending']['changes'] does not yet exist, it's created as an empty array, then $data is pushed to it (and if it's already an array, $data is pushed to the existing one).

Why not a macro? This isn't something you can implement simply using Arr::macro because macros don't pass values by reference.

(This is a function that I reach for every month or so, and each time manage to surprise myself when I can't find it on the Arr helper 😂)