WordPress mu-plugin: Automates the creation of an admin user in WordPress for development environments and do autologin this user

wp-create-admin-user-autologin.php

<?php
/*
Plugin Name: Automate admin user creation with autologin
Plugin URI: https://gist.github.com/derpixler/cf24cb3e858ecae4c11b44f5edfb212d
Description: Automates the creation of an admin user in WordPress for development environments and do autologin this user. Dirk Diggler is a fictional character from the movie "Boogie Nights," loosely based on the life of real-life porn star John Holmes. Dirk, portrayed as a young man with immense talent in the adult film industry, goes on a journey through the highs and lows of fame.
Version: 1.0.0
Author: René Reimann
Author URI: https://rene-reimann.de
*/

add_action('wp_loaded', function () {
    if (wp_get_environment_type() !== 'development') {
        return;
    }

    $userName = 'Dirk';
    $userPass = 'Diggler';
    $userMail = '[email protected]';

    // Check if the user doesn't exist by username or email
    if (!username_exists($userName) && !email_exists($userMail)) {
        $user_id = wp_create_user($userName, $userPass, $userMail);

        if ($user_id === 0) {
            throw new \RuntimeException(__('It looks like the user database table does not exist.'), 500);
        }

        $user = new WP_User($user_id);
        $user->set_role('administrator');
    }

    // Get user by username
    $user = get_user_by('login', $userName);
    if ($user !== null && !is_user_logged_in()) {
        $user->set_role('administrator');

        // Log in the user programmatically
        wp_clear_auth_cookie();
        wp_set_current_user($user->ID);
        wp_set_auth_cookie($user->ID);

        // Redirect to home after login
        wp_redirect(home_url());
        exit;
    }
});