private function buildSqlStringOfAllPtGeocachesId()
{
$this->getGeocaches();
$geocachesIdArray = $this->geocaches->getGeocachesIdArray();
$geocachesStr = '';
foreach ($geocachesIdArray as $geocacheId) {
$geocachesStr .= $geocacheId . ',';
}
return rtrim($geocachesStr, ',');
}