Array
(
    [0] => stdClass Object
        (
            [giorno_ora] => 100000729
            [programma] => Itaca solomusica
        )

    [1] => stdClass Object
        (
            [giorno_ora] => 107300759
            [programma] => Itaca Sport
        )

    [2] => stdClass Object
        (
            [giorno_ora] => 108000859
            [programma] => Buongiorno, Itaca
        )

    [3] => stdClass Object
        (
            [giorno_ora] => 109001059
            [programma] => Non facciamo programmi
        )


$ptr0 = -1;
$ptr1 = -1;
$ptr2 = -1;
$ptr3 = -1;
$ptr4 = -1;
$ptr5 = -1;
$ptr6 = -1;

for ($i = 0; $i < count($array); $i++)
{

    for ($i0 = $ptr0 + 1; $i0 < count($array); $i0++)
    {
        if ($array[$i0]->giorno_ora < "00000000" || $array[$i0]->giorno_ora > "09999999")
        {
            echo "    ";
            break;
        }
        else
        {
            echo $array[$i0]->programma;
            $ptr0 = $i0;
            break;
        }
    }

    for ($i1 = $ptr1 + 1; $i1 < count($array); $i1++)
    {
        if ($array[$i1]->giorno_ora < "00000000" || $array[$i1]->giorno_ora > "09999999")
        {
            echo "    ";
            break;
        }
        else
        {
            echo $array[$i1]->programma;
            $ptr1 = $i1;
            break;
        }
    }

   etc.


}