static function countForCertificate(PluginCertificatesCertificate $item)
 {
     $types = implode("','", $item->getTypes());
     if (empty($types)) {
         return 0;
     }
     return countElementsInTable('glpi_plugin_certificates_certificates_items', "`itemtype` IN ('{$types}')\n                                   AND `plugin_certificates_certificates_id` = '" . $item->getID() . "'");
 }