Untitled

<html>
    <?php

        if($_SERVER['QUERY_STRING']!=""){

            $pass=$_GET['password'];
            $passripetuta=$_GET['ripetipassword'];
            $utente=$_GET['utente'];

            if($pass==$passripetuta){

                $link = mysqli_connect("IP", "xxx", "yyy", "zzz");

                if(!$link){
                    die("error to connect");
                }

                $queryString = "INSERT INTO Utenti VALUES ('$utente', '$pass')";
                //$queryString = "SELECT * FROM Utenti WHERE User='$utente' AND Password='$pass'";

                $inserito = mysqli_query($link, $queryString);

                echo "<head>";
                if($inserito == 1){
                    echo "<meta http-equiv='refresh' content ='3, url=AccediDatabase.php'>";
                }
                echo"</head><body>";

                if($inserito == 1){
                    echo "Utente inserito.";
                }else{
                    echo "Nome utente già presente";
                    visualizzaForm();
                }


                mysqli_close($link);
                echo "</body>";

            }else{
                echo "<head></head><body>";
                echo "password non coincidenti<br>";
                visualizzaForm();
                echo "</body>";
            }

        }else{
            echo "<head></head><body>";
            visualizzaForm();
            echo "</body>";
        }
    ?>

</html>
<?php

    function visualizzaForm(){
        echo "<form action='Registazione.php' method='get'>";
        echo "User: <input type = 'text' name= 'utente'><br>";
        echo "Password: <input type='password' name='password'><br>";
        echo "Ripeti Passsword: <input type ='password' name='ripetipassword'><br>";
        echo "<input type= 'submit' value='Registrati'><br>";
        echo "</form>";
    }
?>