Set color on the WordPress admin bar depending the current environment

AdminBarEnvColors

<?php namespace TCV;

class EnvSwitcher
{
    public function __construct()
    {
        $this->setEnv();

        add_filter('body_class', [$this, 'add_env_body_class']);
        add_filter('admin_body_class', [$this, 'add_env_body_class']);

        add_action('admin_head', [$this, 'add_env_color_to_admin_bar']);
        add_action('wp_head', [$this, 'add_env_color_to_admin_bar']);
    }

    public function setEnv()
    {
        /*
         * This is not needed if you are running a bedrock setup.
         */

        if (defined('WP_ENV')) {
            return;
        }

        /*
         * You can also use $_SERVER['SERVER_NAME']
         */
        switch ($_SERVER['SERVER_ADDR']) {
            case '127.0.0.1':
                define('WP_ENV', 'development');
                break;
            case 'stage server IP':
                define('WP_ENV', 'staging');
                break;
            default:
                define('WP_ENV', 'production');
        }
    }

    public function add_env_body_class($classes)
    {
        if (defined('WP_ENV')) {
            $envClass = 'env-' . WP_ENV;
            if (is_string($classes)) {
                $classes .= " $envClass  ";
            } else if (is_array($classes)) {
                $classes[] = $envClass;
            }
        }

        return $classes;
    }

    public function add_env_color_to_admin_bar()
    {
        if (!is_user_logged_in()) {
            return;
        }

        echo '<style>
        /* Development admin bar bg-color */
        .env-development #wpadminbar,
        .env-development #wpadminbar .ab-top-menu > li > .ab-item,
        .env-development #wpadminbar .ab-top-menu > li > .ab-item:before {
            background: #698779 !important;
            color: #FFF !important;
        }
        
        /* Staging admin bar bg-color */
        .env-staging #wpadminbar,
        .env-staging #wpadminbar .ab-top-menu > li > .ab-item,
        .env-staging #wpadminbar .ab-top-menu > li > .ab-item:before {
            background: #E7BA2F !important;
            color: #FFF !important;
        }
        
        /* Production admin bar bg-color */
        .env-production #wpadminbar,
        .env-production #wpadminbar .ab-top-menu > li > .ab-item,
        .env-production #wpadminbar .ab-top-menu > li > .ab-item:before {
            background: #90443b !important;
            color: #FFF !important;
        }
        
        /* Hover text color */
        #wpadminbar .ab-top-menu > li.hover > .ab-item:before,
        #wpadminbar .ab-top-menu > li.hover > .ab-item,
        #wpadminbar .ab-top-menu > li.hover > .ab-item .ab-label,
        #wpadminbar .ab-top-menu > li.hover > .ab-item .ab-icon:before {
            color: #DDD !important;
        }
        </style>';
    }
}