php：为什么我不能插入我的数据库？

First of all, I am not getting any errors but it still doesn't work. I simply want to insert in my table... I've also tryed

mysqli_query($db, "INSERT INTO Rangliste2 (name, score) VALUES ('$text', $zahl)");

before, with the same, unsatisfying result.

<?php>
// score speichern
$zahl = $_POST["text2"];

// name speichern
$text = $_POST["text1"];
if($text == null){
    echo("Keinen Text empfangen.");
} 


// verbindung zu db herstellen
$db = @new mysqli("...", "...", "...", "...");
if($db->connect_error){
    die("<pre>".$db->connect_error."</pre>");
}

$sql = $db->query("INSERT INTO Rangliste2 (name, score) VALUES ('$text', $zahl)");

//sql abfrage
$sql = $db->query("SELECT * FROM Rangliste2 ORDER BY score DESC");
$num = $sql->num_rows; // anzahl der Datensätze
if($num > 0){
    while($row = $sql->fetch_object()){
        echo ("$row->name:       $row->score
");
    }
}
?>

When I look at my db table, nothing has been inserted... I appreciate every answer !