/**
 * Implements hook_requirements().
 */
function {{ machine_name }}_requirements($phase) {
  $requirements = [];

  // Report Drupal version
  if ($phase == 'runtime') {
    $requirements['drupal'] = [
      'title' => t('Drupal'),
      'value' => \Drupal::VERSION,
      'severity' => REQUIREMENT_INFO,
    ];
  }

  // Test PHP version
  $requirements['php'] = [
    'title' => t('PHP'),
    'value' => ($phase == 'runtime') ? \Drupal::l(phpversion(), new Url('system.php')) : phpversion(),
  ];
  if (version_compare(phpversion(), DRUPAL_MINIMUM_PHP) < 0) {
    $requirements['php']['description'] = t('Your PHP installation is too old. Drupal requires at least PHP %version.', ['%version' => DRUPAL_MINIMUM_PHP]);
    $requirements['php']['severity'] = REQUIREMENT_ERROR;
  }

  // Report cron status
  if ($phase == 'runtime') {
    $cron_last = \Drupal::state()->get('system.cron_last');

    if (is_numeric($cron_last)) {
      $requirements['cron']['value'] = t('Last run @time ago', ['@time' => \Drupal::service('date.formatter')->formatTimeDiffSince($cron_last)]);
    }
    else {
      $requirements['cron'] = [
        'description' => t('Cron has not run. It appears cron jobs have not been setup on your system. Check the help pages for <a href=":url">configuring cron jobs</a>.', [':url' => 'https://www.drupal.org/cron']),
        'severity' => REQUIREMENT_ERROR,
        'value' => t('Never run'),
      ];
    }

    $requirements['cron']['description'] .= ' ' . t('You can <a href=":cron">run cron manually</a>.', [':cron' => Url::fromRoute('system.run_cron')->toString()]);

    $requirements['cron']['title'] = t('Cron maintenance tasks');
  }

  return $requirements;
}