phparraysrotation

Rotate a flat array to begin with a specified element

I have an array of elements like this:

$data = array(1, 2, 3, 4);

How can I reorder for example, starting from second element to get 2, 3, 4, 1; or starting from third element to get 3, 4, 1, 2?

Solution

  • One solution is to use array_slice function to separate the two portions and combine them with array_merge:

    $data = [1, 2, 3, 4];
$pos = 2;
$ordered = array_merge(
    array_slice($data, $pos),
    array_slice($data, 0, $pos)
);
// [3, 4, 1, 2]