Issue #3178175 by longwave, Kristen Pol: aggregator_requirements() checks that...

 * Install, update and uninstall functions for the aggregator module.

 */

/**

 * Implements hook_requirements().

 */

function aggregator_requirements($phase) {

  $has_curl = function_exists('curl_init');

  $requirements = [];

  $requirements['curl'] = [

    'title' => t('cURL'),

    'value' => $has_curl ? t('Enabled') : t('Not found'),

  ];

  if (!$has_curl) {

    $requirements['curl']['severity'] = REQUIREMENT_ERROR;

    $requirements['curl']['description'] = t('The Aggregator module requires the <a href="https://secure.php.net/manual/en/curl.setup.php">PHP cURL library</a>. For more information, see the <a href="https://www.drupal.org/docs/system-requirements/php-requirements#curl">online information on installing the PHP cURL extension</a>.');

  }

  return $requirements;

}

/**

 * Implements hook_update_last_removed().

 */