_update_manager_unique_identifier()
Returns a short unique identifier for this Drupal installation.
An eight character string uniquely identifying this Drupal installation.
function _update_manager_unique_identifier() { $id = &drupal_static(__FUNCTION__, ''); if (empty($id)) { $id = substr(hash('sha256', Settings::getHashSalt()), 0, 8); } return $id; }
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https://api.drupal.org/api/drupal/core!modules!update!update.module/function/_update_manager_unique_identifier/8.1.x