mi rispondo da solo

$keys = array_keys($out);
for($a=0; $a<count($out); $a++){


switch ($a) {
case 0:
$ar_1[] = $out[$keys[$a]];
break;

case 1:
$ar_2[] = $out[$keys[$a]];
break;

case 2:
$ar_3[] = $out[$keys[$a]];
break;

case 3:
$ar_4[] = $out[$keys[$a]];
break;
}
}


alla prossima
grazie