...

    $titles = $html->find("a[class=in-match]"); // 1 per match
$result = $html->find("td[class=h-text-center]/a"); // 1
$best_bets = $html->find("td[class=table-matches__odds colored]/span/span/span"); // 1
$odds = $html->find("td[class=table-matches__odds]"); // 2

function print_odd($odd) {
    if (array_key_exists('data-odd', $odd->attr)) {
        return $odd->attr['data-odd'];
    }

    return $odd->children(0)->children(0)->children(0)->attr['data-odd'];
}


$c=0; $b=0; $o=0; $z=0; // two counters
foreach ($titles as $match) {
    list($num1, $num2) = explode(':', $result[$c++]->innertext); // <- explode
    $num1 = intval($num1);
    $num2 = intval($num2);
    $num3 = ($num1 + $num2);
    if ($num3 > 1){

        $over15 = "OK";
    }else {

            $over15 = "NO";
        }


                echo "<tr><td class='rtitle'>".

            "<td class='first-cell'>".$match->innertext."</td> "  .




            "<td>".$match->innertext."</td><td> ".$num1.'</td><td> : </td><td>'.$num2 .  " / " .  // <- example use
            "<td class='first-cell'>".$num3 ."</td> "  .
            "<td class='first-cell'>".$over15 ."</td> "  .
            "<td class='odds'>".print_odd($odds[$b++]) . ";" .
            "".print_odd($odds[$b++]) . ";" .
            "".print_odd($odds[$b++]) . "</td>" .
            "</td></tr><br/>";


        $servername = "xx.xxx.xxx.xxx";
$username = "xxx";
$password = "xxx";
$dbname = "xxxxxxxx";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "INSERT INTO risultati (titles, scorehome, scoreaway, best_bets)
VALUES ('$match', '$num1', '$num2', '$odds');";


if ($conn->multi_query($sql) === TRUE) {
    echo "New records created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();