let's say we have the following associative array:
$array = array(
 "red" => "ferrari",
 "yellow" => "volkswagen",
 "green" => "mercedes",
 "blue" => "volvo"
);
now: how do i get the key of the next array element (in this case "green")?
$next = ?

Why not define your array with number index as well in the first place?

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