currency-8.x-3.3/modules/currency_intl/currency_intl.install

<?php

/**
 * @file
 * Contains installation, uninstallation, and update functionality.
 */

/**
 * Implements hook_requirements().
 */
function currency_intl_requirements($phase) {
  $loaded = extension_loaded('intl');
  $requirements['currency_intl_extension_intl'] = [
    'description' => t('Intl can be used to format amounts according the locales of users.'),
    'title' => t('PHP Intl extension'),
    'value' => $loaded ? t('Loaded') : t('Not loaded'),
    'severity' => $loaded ? REQUIREMENT_OK : REQUIREMENT_INFO,
  ];

  return $requirements;
}