how to run php code sequnciellay in array_map code example

Example 1: php map array

function cube($number)
{
    return ($number * $number * $number);
}

$nums = [1, 2, 3, 4, 5];
$cubed = array_map('cube', $nums);

Example 2: php array map

$func = function cube($n) {
    return ($n * $n * $n);
}
$a = [1, 2, 3, 4, 5];
$b = array_map( $func, $a );

// Outputs: Array (
//    [0] => 2
//    [1] => 4
//    [2] => 6
//    [3] => 8
//    [4] => 10
// )