I want to separate numbers by a space, in sets of 4. e.g. 1234567890, would become 1234 5678 90

I managed to create a script to achieve this, but it seems over the top, is there any easier way of achieving this?

```
$num = 23853267362365;
$count = strlen($num)/4;

$new_num = array();
for ($x = 1; $x <= $count; $x++) {
    $num_len = strlen($num);
    if($num_len>4) {
        $new_num[] = substr($num,0,4);
        $num = substr($num,4,$num_len-4);
    }
}

$num = implode(' ',$new_num);

```