Php array - how to create an array inserting the same value before each value taken from another array (without loop)?

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PHP

I have the following variables:

$id = 1;
$data = [3, 17, 19, 21];

I need to create an array inserting the $id value before each value taken from $data, i.e.:

array (
  0 => 1,
  1 => 3,
  2 => 1,
  3 => 17,
  4 => 1,
  5 => 19,
  6 => 1,
  7 => 21,
)

How can I accomplish this without a loop?

What I have tried:

$id = 1;
$data = [3, 17, 19, 21];

foreach ($data as $val) {
  $array[] = $id;
  $array[] = $val;
}

It works, but I would like to find an alternative solution, like a built-in function.