PHP: Create Array with arbitrary Index - Index should not start at 0 and can have Gaps

Yes, both things are possible.

I will give you a small example.

$arr = array();
$arr[1] = 'A';
$arr[4] = 'B';

In this code, we are creating an array and we are setting the value "A" to the index 1 and the value "B" to the index 4. With this, the first element does not have the index 0 (instead it is 1) and the indices 2 and 3 are not allocated. So, you can create arrays with arbitrary index values.

$arr = array([1] => 'A', [4] => 'B');

Alternatively, you can also use this notation, this code is creating the same result like it is shown in the first example in only one line of code.
2015-06-09 at 22:50