mysql - sql syntax-error at inserting php post vars

        $username = $_POST['username'];
        $score = $_POST['score'];


        $mysqlhost = "localhost"; // MySQL-Host angeben
        $mysqluser = "***********"; // MySQL-User angeben
        $mysqlpwd = "***********"; // Passwort angeben

        $connection = mysql_connect($mysqlhost, $mysqluser, $mysqlpwd) or die("Verbindungsversuch fehlgeschlagen");

        $mysqldb="db2507004-seminarfach"; // Gewuenschte Datenbank angeben
        mysql_select_db($mysqldb, $connection) or die("Konnte die Datenbank nicht waehlen.");

        $sql = "INSERT INTO highscore (username, score) VALUES ('".$username."' , '".$score."');";

        $query = "$connection, $sql";
        $db_erg = mysql_query($query) or die("Anfrage fehlgeschlagen: " . mysql_error());
    ?>

always when i try to insert data into my table i get this error:"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Resource id #2, INSERT INTO highscore (username, score) VALUES ('peter silie' , ' at line 1" and i don't know what is wrong with it.

in my table username is a varchar and score an int.

hope someone could help me.

Answer

This is wrong: $query = "$connection, $sql";

$query = $sql;

$db_erg = mysql_query($query) or die("Anfrage fehlgeschlagen: " . mysql_error());