Creating array of IDs from HTML form array for detach() method

Hello all!

I am attempting to use the detach() method on a many-to-many pivot table and having trouble creating an array of IDs to send to the method.

From the Laravel 5.8 documentation:

For convenience, attach and detach also accept arrays of IDs as input:

$user = App\User::find(1);

$user->roles()->detach([1, 2, 3]);

My HTML form is sending the correct array of checkbox values as the following:

array:1 [ "input" => array:3 [ 0 => "562" 1 => "570" 2 => "574" ] ]

My question is, how do I make a new array from the values of my form input to send to the detach() method?I have tried all kinds of loops and array functions but always end up with a new array with key=>value pairs. According to the documentation, I need an array that looks like this:

detach([562,570,574]);