DB

17abstract class DB implements Base18{19    /**20     * Helper for database conversion21     *22     * Converts a given {@see SimplePie} object into data to be stored23     *24     * @param \SimplePie\SimplePie $data25     * @return array{string, array<string, Item>} First item is the serialized data for storage, second item is the unique ID for this item26     */27    protected static function prepare_simplepie_object_for_cache(\SimplePie\SimplePie $data)28    {29        $items = $data->get_items();30        $items_by_id = [];31 32        if (!empty($items)) {33            foreach ($items as $item) {34                $items_by_id[$item->get_id()] = $item;35            }36 37            if (count($items_by_id) !== count($items)) {38                $items_by_id = [];39                foreach ($items as $item) {40                    $items_by_id[$item->get_id(true)] = $item;41                }42            }43 44            if (isset($data->data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['feed'][0])) {45                $channel = &$data->data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['feed'][0];46            } elseif (isset($data->data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['feed'][0])) {47                $channel = &$data->data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['feed'][0];48            } elseif (isset($data->data['child'][\SimplePie\SimplePie::NAMESPACE_RDF]['RDF'][0])) {49                $channel = &$data->data['child'][\SimplePie\SimplePie::NAMESPACE_RDF]['RDF'][0];50            } elseif (isset($data->data['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['rss'][0]['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['channel'][0])) {51                $channel = &$data->data['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['rss'][0]['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['channel'][0];52            } else {53                $channel = null;54            }55 56            if ($channel !== null) {57                if (isset($channel['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['entry'])) {58                    unset($channel['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['entry']);59                }60                if (isset($channel['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['entry'])) {61                    unset($channel['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['entry']);62                }63                if (isset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_10]['item'])) {64                    unset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_10]['item']);65                }66                if (isset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_090]['item'])) {67                    unset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_090]['item']);68                }69                if (isset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['item'])) {70                    unset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['item']);71                }72            }73            if (isset($data->data['items'])) {74                unset($data->data['items']);75            }76            if (isset($data->data['ordered_items'])) {77                unset($data->data['ordered_items']);78            }79        }80        return [serialize($data->data), $items_by_id];81    }82}