Антон Антон

<input type="hidden" value="" name="i"><label><input type="checkbox" value="yes" name="i">Согласен</label>

if (!is_set($_POST['i']))
   {
    echo 'не отмечено';
}
else {
    echo 'отмечено';
}

function convert($data) {
        $result = [];
        $needle = NIL;

        foreach ($data as $item) {
            if ($item - 1 !== $needle) {
                if ($needle !== NIL) {
                    $obj['end'] = $needle;
                    $result[] = $obj;
                }
                $obj = ['start' => $item];
            }
            $needle = $item;
        }
        $obj['end'] = $item;
        $result[] = $obj;

        return $result;
    }

    print_r(convert([0, 1, 2, 3, 4, 5]));
    print_r(convert([0, 1, 2, 3, 6, 7, 8, 9, 12, 13, 14, 15]));
    print_r(convert([94, 95]));
    print_r(convert([0, 1, 94, 95]));

Select
ID,
Name as Client,
Destination
from T1
Union All
select 
ID,
IP,
Destination
from t2