class SystemInfoController

class SystemInfoController implements ContainerInjectionInterface {
    
    /**
     * System Manager Service.
     *
     * @var \Drupal\system\SystemManager
     */
    protected $systemManager;
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('system.manager'));
    }
    
    /**
     * Constructs a SystemInfoController object.
     *
     * @param \Drupal\system\SystemManager $systemManager
     *   System manager service.
     */
    public function __construct(SystemManager $systemManager) {
        $this->systemManager = $systemManager;
    }
    
    /**
     * Displays the site status report.
     *
     * @return array
     *   A render array containing a list of system requirements for the Drupal
     *   installation and whether this installation meets the requirements.
     */
    public function status() {
        $requirements = $this->systemManager
            ->listRequirements();
        return [
            '#type' => 'status_report_page',
            '#requirements' => $requirements,
        ];
    }
    
    /**
     * Returns the contents of phpinfo().
     *
     * @return \Symfony\Component\HttpFoundation\Response
     *   A response object to be sent to the client.
     */
    public function php() {
        if (function_exists('phpinfo')) {
            ob_start();
            phpinfo(~(INFO_VARIABLES | INFO_ENVIRONMENT));
            $output = ob_get_clean();
        }
        else {
            $output = t('The phpinfo() function has been disabled for security reasons. For more information, visit <a href=":phpinfo">Enabling and disabling phpinfo()</a> handbook page.', [
                ':phpinfo' => 'https://www.drupal.org/node/243993',
            ]);
        }
        return new Response($output);
    }

}