itsowncordova314

<?php

$data = [
    [708],
    [709],
    [710],
];

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($data));
$result = iterator_to_array($iterator, false);

var_dump($result);

array(3) {
  [0]=>
  int(708)
  [1]=>
  int(709)
  [2]=>
  int(710)
}