public function treeGetChildsByIdAction()
 {
     $assets = array();
     $asset = Asset::getById($this->_getParam("node"));
     if ($asset->hasChilds()) {
         $limit = intval($this->_getParam("limit"));
         if (!$this->_getParam("limit")) {
             $limit = 100000000;
         }
         $offset = intval($this->_getParam("start"));
         // get assets
         $childsList = new Asset_List();
         $childsList->setCondition("parentId = ?", $asset->getId());
         $childsList->setLimit($limit);
         $childsList->setOffset($offset);
         $childsList->setOrderKey("filename");
         $childsList->setOrder("asc");
         $childs = $childsList->load();
         foreach ($childs as $childAsset) {
             if ($childAsset->isAllowed("list")) {
                 $assets[] = $this->getTreeNodeConfig($childAsset);
             }
         }
     }
     if ($this->_getParam("limit")) {
         $this->_helper->json(array("total" => $asset->getChildAmount(), "nodes" => $assets));
     } else {
         $this->_helper->json($assets);
     }
     $this->_helper->json(false);
 }
    $allowedThumbs = explode(",", $opts->getOption("thumbnails"));
}
// get only images
$conditions = array("type = 'image'");
if ($opts->getOption("parent")) {
    $parent = Asset::getById($opts->getOption("parent"));
    if ($parent instanceof Asset_Folder) {
        $conditions[] = "path LIKE '" . $parent->getFullPath() . "/%'";
    } else {
        echo $opts->getOption("parent") . " is not a valid asset folder ID!\n";
        exit;
    }
}
$list = new Asset_List();
$list->setCondition(implode(" AND ", $conditions));
$total = $list->getTotalCount();
$perLoop = 10;
for ($i = 0; $i < ceil($total / $perLoop); $i++) {
    $list->setLimit($perLoop);
    $list->setOffset($i * $perLoop);
    $images = $list->load();
    foreach ($images as $image) {
        foreach ($thumbnails as $thumbnail) {
            if (empty($allowedThumbs) || in_array($thumbnail, $allowedThumbs)) {
                echo "generating thumbnail for image: " . $image->getFullpath() . " | " . $image->getId() . " | Thumbnail: " . $thumbnail . " : " . formatBytes(memory_get_usage()) . " \n";
                $image->getThumbnail($thumbnail);
            }
        }
    }
    Pimcore::collectGarbage();
}