Yosymfony\Spress\Core\Support\ArrayWrapper::get PHP Method

    public function get($key, $default = null)
    {
        $array = $this->array;
        $unescapedKey = $this->unescapeDotKey($key);
        if (isset($array[$unescapedKey])) {
            return $array[$unescapedKey];
        }
        foreach (explode('.', $this->escapedDotKeyToUnderscore($key)) as $segment) {
            $segment = $this->underscoreDotKeyToDot($segment);
            if (is_array($array) === false || array_key_exists($segment, $array) === false) {
                return $default;
            }
            $array = $array[$segment];
        }
        return $array;
    }

 /**
  * @inheritDoc
  *
  * @throws Yosymfony\Spress\Core\Exception\AttributeValueException if bad attribute value.
  */
 public function generateItems(ItemInterface $templateItem, array $collections)
 {
     $result = [];
     $options = $this->getAttributesResolver($templateItem);
     if ($options['max_page'] < 1) {
         throw new AttributeValueException('Items per page value must be great than 0.', 'max_page', $templateItem->getPath(ItemInterface::SNAPSHOT_PATH_RELATIVE));
     }
     $arr = new ArrayWrapper($collections);
     $providerName = $this->providerToCollection($options['provider']);
     if ($arr->has($providerName) === false || is_array($provider = $arr->get($providerName)) === false) {
         throw new AttributeValueException(sprintf('Provider: "%s" for pagination not found.', $options['provider']), 'provider', $templateItem->getPath(ItemInterface::SNAPSHOT_PATH_RELATIVE));
     }
     $arr->setArray($provider);
     $pages = $arr->paginate($options['max_page']);
     $totalPages = count($pages);
     $totalItems = count($provider);
     $templatePath = dirname($templateItem->getPath(Item::SNAPSHOT_PATH_RELATIVE));
     if ($templatePath === '.') {
         $templatePath = '';
     }
     foreach ($pages as $page => $items) {
         $previousPage = $page > 1 ? $page - 1 : null;
         $previousPagePath = $this->getPageRelativePath($templatePath, $options['permalink'], $previousPage);
         $previousPageUrl = $this->getPagePermalink($previousPagePath);
         $nextPage = $page === $totalPages ? null : $page + 1;
         $nextPagePath = $this->getPageRelativePath($templatePath, $options['permalink'], $nextPage);
         $nextPageUrl = $this->getPagePermalink($nextPagePath);
         $pageAttr = new ArrayWrapper($templateItem->getAttributes());
         $pageAttr->set('pagination.per_page', $options['max_page']);
         $pageAttr->set('pagination.total_items', $totalItems);
         $pageAttr->set('pagination.total_pages', $totalPages);
         $pageAttr->set('pagination.page', $page);
         $pageAttr->set('pagination.previous_page', $previousPage);
         $pageAttr->set('pagination.previous_page_path', $previousPagePath);
         $pageAttr->set('pagination.previous_page_url', $previousPageUrl);
         $pageAttr->set('pagination.next_page', $nextPage);
         $pageAttr->set('pagination.next_page_path', $nextPagePath);
         $pageAttr->set('pagination.next_page_url', $nextPageUrl);
         $pageAttr->remove('permalink');
         $pagePath = $this->getPageRelativePath($templatePath, $options['permalink'], $page);
         $permalink = $this->getPagePermalink($pagePath);
         $item = new PaginationItem($templateItem->getContent(), $pagePath, $pageAttr->getArray());
         $item->setPageItems($items);
         $item->setPath($pagePath, Item::SNAPSHOT_PATH_RELATIVE);
         $item->setPath($permalink, Item::SNAPSHOT_PATH_PERMALINK);
         $result[] = $item;
     }
     return $result;
 }