如何使用验证函数从数据库中检索password_hash？ PHP＆amp;库MySQLi

Question

我试图检查输入的密码是否与使用函数的散列密码匹配，但我不确定如何检索散列值并将其分配给变量，以便我可以在登录中的查询中使用它功能。但它给了我他们不匹配的错误。

$login = login($username, $password);
    if ($login === false) {
        $errors[] = "That username and password combination is incorrect";
    } else {
        $_SESSION['login'] = $login;
        header("Location: profile.php");
    }

function hashPass($password) {
    $password = password_hash($password, PASSWORD_BCRYPT);
    return $password;
}

function verifyPass($username, $password) {
    global $conn;
    $query = "SELECT userPass FROM users where userName = '$username'";
    $result = mysqli_query($conn, $query);
    if (mysqli_num_rows($result) > 0) {
        while($row = mysqli_fetch_assoc($result)) {
            if (password_verify($password, $row['userPass'])) {
                return $row['userPass'];
            }
        }
    } else {
        return false;
    }
}

function login($username, $password) {
    global $conn;
    $password = verifyPass($password);
    $query = "SELECT userId FROM users where userName = '$username' AND userPass = '$password'";
    $result = mysqli_query($conn, $query);
    if (mysqli_num_rows($result) > 0) {
        while($row = mysqli_fetch_assoc($result)) {
            return $row['userId'];
        }
    } else {
        return false;
    }
}