Weak hands cannot be planted, meager skills have no foundation. Shallow wisdom is futile, how can one hope for a good name?扰扰从役倦，屑屑身事微。少壮轻年月，迟暮惜光辉。
} First item is the serialized data for storage, second item is the unique ID for this item
*/
protected static function prepare_simplepie_object_for_cache(\SimplePie\SimplePie $data)
{
$items = $data->get_items();
$items_by_id = [];
if (!empty($items)) {
foreach ($items as $item) {
$items_by_id[$item->get_id()] = $item;
}
if (count($items_by_id) !== count($items)) {
$items_by_id = [];
foreach ($items as $item) {
$items_by_id[$item->get_id(true)] = $item;
}
}
if (isset($data->data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['feed'][0])) {
$channel = &$data->data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['feed'][0];
} elseif (isset($data->data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['feed'][0])) {
$channel = &$data->data['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['feed'][0];
} elseif (isset($data->data['child'][\SimplePie\SimplePie::NAMESPACE_RDF]['RDF'][0])) {
$channel = &$data->data['child'][\SimplePie\SimplePie::NAMESPACE_RDF]['RDF'][0];
} elseif (isset($data->data['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['rss'][0]['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['channel'][0])) {
$channel = &$data->data['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['rss'][0]['child'][\SimplePie\SimplePie::NAMESPACE_RSS_20]['channel'][0];
} else {
$channel = null;
}
if ($channel !== null) {
if (isset($channel['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['entry'])) {
unset($channel['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['entry']);
}
if (isset($channel['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['entry'])) {
unset($channel['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['entry']);
}
if (isset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_10]['item'])) {
unset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_10]['item']);
}
if (isset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_090]['item'])) {
unset($channel['child'][\SimplePie\SimplePie::NAMESPACE_RSS_090]['item']);