Awesome class!! I tried to do a simple create user function (without database or HTTP responses)

<?php

declare(strict_types=1);

$authorData = [
    'name' => 'Laracast',
    'email' => 'laracast@gmail.com',
    'password' => 'password'
];

$createUser = [];

function sendWelcomeEmail(): void
{
    echo 'Welcome to laracast';
}

function logUser(string $email, string $password): void
{
    echo 'Auth User';
    return;
}

$registerUser = function (array $data) use ($createUser) {

    if (!filter_var($data['email'], FILTER_VALIDATE_EMAIL)) {
        echo "Password invalid";
        return;
    }

    $data['password'] = password_hash($data['password'], PASSWORD_DEFAULT);

    array_push($createUser, $data);

    logUser($data['email'], $data['password']);

    sendWelcomeEmail();

    header('Location: dashboard.php');
};

$registerUser($authorData);

Technical Check-in #1 (With Exam)