php issues

<?php
$host_name = "db690172471.db.1and1.com";
$database = "db690172471";
$user_name = "dbo690172471";
$password = "JrJsmpXH5SM24Z4R";

$connect = mysqli_connect($host_name, $user_name, $password, $database);

if ($connect) {
    //  Stuff to do when connected to DB

    //  Retrieves the username value from post
    $username=$_POST["email"];
    $pwh=$_POST["pwh"];

    //  Checks to see if the username exists...
    $sql="SELECT email FROM Users WHERE email='$username'";
    $sql=mysqli_real_escape_string($connect, $sql);

    $query = mysqli_query($connect,$sql);

    if (mysqli_num_rows($query) != 0) {
        //  User already exists so check pw and set session varb to logged in
        echo "user exists";

    } else {
        //  Need to create user.
        echo "user $username does not exist";

        //  Adds the details to the db?
        $sql="INSERT INTO Users (email, password) VALUES ('$username', '$pwh');";

        $sql=mysqli_real_escape_string($connect, $sql);

        $query2=mysqli_query($connect,$sql);

        if ($query2) {

            echo "New record created successfully";

        } else {

            //echo "Error: " . $sql . "<br>" . $connect->error;
            echo "error"        ;
        }

    }
}
else
{
    //  Stuff to do when not connected...
    echo "problemo";
}

?>