currency-8.x-3.3/currency.install

<?php

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

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

  // Do not use ::class constants, because we do not want to cause autoloading
  // errors.
  $classes = [
    // A class belonging to commercie/currency.
    '\Commercie\Currency\Currency',
    // A class belonging to commercie/currency-exchange.
    '\Commercie\CurrencyExchange\ExchangeRate',
  ];
  foreach ($classes as $class) {
    if (!class_exists($class)) {
      $requirements['currency_composer'] = [
        'description' => t('Currency requires Composer dependencies. Read the <a href="@url">documentation</a> on how to install them.', [
          '@url' => 'https://www.drupal.org/node/2627292',
        ]),
        'severity' => REQUIREMENT_ERROR,
      ];
      break;
    }
  }

  return $requirements;
}