注册过程未插入数据库

My register.inc.php未成功将用户信息插入数据库。但是它将我重定向到register_success.php。

我在添加到插入的数据时遗漏了什么吗？

寄存器.inc.php：

include_once 'config.php';
include_once 'db_connect.php';
$error_msg = "";
if (isset($_POST['username'],
        $_POST['firstname'],
        $_POST['lastname'],
        $_POST['home_address1'],
        $_POST['home_address2'],
        $_POST['home_city'],
        $_POST['home_state'],
        $_POST['home_zipcode'],
        $_POST['email'],
        $_POST['p'])) {
// Sanitize and validate the data passed in
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$firstname = filter_input(INPUT_POST, 'firstname', FILTER_SANITIZE_STRINGS);
$lastname = filter_input(INPUT_POST, 'lastname', FILTER_SANITIZE_STRINGS);
$home_address1 = filter_input(INPUT_POST, 'home_address1', FILTER_SANITIZE_STRINGS);
$home_address2 = filter_input(INPUT_POST, 'home_address2', FILTER_SANITIZE_STRINGS);
$home_city = filter_input(INPUT_POST, 'home_city', FILTER_SANITIZE_STRINGS);
$home_state = filter_input(INPUT_POST, 'home_state', FILTER_SANITIZE_STRINGS);
$home_zipcode = filter_input(INPUT_POST, 'home_zipcode', FILTER_SANITIZE_STRINGS);
$email = filter_input(INPUT_POST, 'email', FILTER_SANITIZE_EMAIL);
$email = filter_var($email, FILTER_VALIDATE_EMAIL);
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Not a valid email
    $error_msg .= '<p class="error">The email address you entered is not valid</p>';
}
$password = filter_input(INPUT_POST, 'p', FILTER_SANITIZE_STRING);
if (strlen($password) != 128) {
    // The hashed pwd should be 128 characters long.
    // If it's not, something really odd has happened
    $error_msg .= '<p class="error">Invalid password configuration.</p>';
}
// Username validity and password validity have been checked client side.
// This should should be adequate as nobody gains any advantage from
// breaking these rules.
//
$prep_stmt = "SELECT user_id FROM users WHERE email = ? LIMIT 1";
$stmt = $mysqli->prepare($prep_stmt);
// check existing email  
if ($stmt) {
    $stmt->bind_param('s', $email);
    $stmt->execute();
    $stmt->store_result();
    if ($stmt->num_rows == 1) {
        // A user with this email address already exists
        $error_msg .= '<p class="error">A user with this email address already exists.</p>';
                    $stmt->close();
    }
            $stmt->close();
} else {
    $error_msg .= '<p class="error">Database error Line 39</p>';
            $stmt->close();
}
// check existing username
$prep_stmt = "SELECT user_id FROM users WHERE username = ? LIMIT 1";
$stmt = $mysqli->prepare($prep_stmt);
if ($stmt) {
    $stmt->bind_param('s', $username);
    $stmt->execute();
    $stmt->store_result();
            if ($stmt->num_rows == 1) {
                    // A user with this username already exists
                    $error_msg .= '<p class="error">A user with this username already               exists</p>';  
                    $stmt->close();
            }
            $stmt->close();
    } else {
            $error_msg .= '<p class="error">Database error line 55</p>';
            $stmt->close();
    }
// TODO: 
// We'll also have to account for the situation where the user doesn't have
// rights to do registration, by checking what type of user is attempting to
// perform the operation.
if (empty($error_msg)) {
    // Create a random salt
    //$random_salt = hash('sha512', uniqid(openssl_random_pseudo_bytes(16), TRUE)); // Did not   work
    $random_salt = hash('sha512', uniqid(mt_rand(1, mt_getrandmax()), true));
    // Create salted password 
    $password = hash('sha512', $password . $random_salt);
    // Insert the new user into the database 
    if ($insert_stmt = $mysqli->prepare("INSERT INTO users (username,
                                                            firstname,
                                                            lastname,
                                                            home_address1,
                                                            home_address2,
                                                            home_city,
                                                            home_state,
                                                            home_zipcode,
                                                            email,
                                                            password,
                                                            salt) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)")) {
        $insert_stmt->bind_param('sssssssssss', $username, $firstname, $lastname, $home_address1, $home_address2, $home_city, $home_state, $home_zipcode, $email, $password, $random_salt);
        // Execute the prepared query.
        if (! $insert_stmt->execute()) {
            header('Location: ./error.php?err=Registration failure: INSERT');
        }
    }
    header('Location: ./register_success.php');
  }
}