farm-2.x-dev/modules/core/geo/farm_geo.install

<?php

/**
 * @file
 * Install, update and uninstall function for the farm_geo module.
 */

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

  // Do not check requirements in the update phase.
  // The REQUIREMENT_WARNING severity prevents updates from being run.
  if ($phase == 'update') {
    return $requirements;
  }

  // Check for php-geos extension.
  if (geoPHP::geosInstalled()) {
    $severity = REQUIREMENT_OK;
    // phpcs:ignore Squiz.PHP.LowercasePHPFunctions.CallUppercase -- GEOSVersion() function is defined in php-geos.
    $message = t('GEOS PHP extension installed. GEOS version @version', ['@version' => GEOSVersion()]);
  }
  else {
    $severity = REQUIREMENT_WARNING;
    $message = t('The GEOS PHP extension is not installed. While not required, it is strongly recommended for accurate geometry arithmetic. See %link for more information.', ['%link' => 'https://geophp.net/geos.html']);
  }
  $requirements['geos'] = [
    'title' => t('GEOS PHP extension'),
    'severity' => $severity,
    'value' => $message,
  ];

  return $requirements;
}