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<?php declare(strict_types=1); |
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namespace Compolomus\RssReader; |
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use DateTime; |
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use DOMDocument; |
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use DOMXPath; |
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use function array_column; |
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use function array_merge; |
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use function count; |
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use function crc32; |
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use function in_array; |
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use function strip_tags; |
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use function trim; |
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class RssReader |
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{ |
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public function __construct( |
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public array $channels = [], |
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public ?CacheInterface $cache = null, |
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public int $limit = 0, |
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) { |
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if (!empty($_ENV['RSSREADER_LIMIT'])) { |
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$this->limit = (int) $_ENV['RSSREADER_LIMIT']; |
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} |
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if (null === $this->cache) { |
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$this->cache = new FileCache(); |
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} |
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} |
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/** |
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* @throws \Exception |
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*/ |
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protected function getPostsFromChannel(string $chanel): ?array |
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{ |
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// Load document |
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$dom = new DOMDocument(); |
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$dom->load($chanel); |
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// Extract all items |
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$items = $dom->getElementsByTagName('item'); |
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// Build XPath object |
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$xpath = new DOMXpath($dom); |
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// Parse all items in loop |
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$result = []; |
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foreach ($items as $item) { |
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$link = $item->getElementsByTagName('link')->item(0)->nodeValue; |
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$itemId = crc32($link); |
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$timestamp = (new DateTime($item->getElementsByTagName('pubDate')->item(0)->nodeValue))->getTimestamp(); |
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// Extract posts which is not in a cache |
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if (!in_array($itemId, $this->cache->getIds(), false)) { |
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$result[] = [ |
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'id' => $itemId, |
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'title' => $item->getElementsByTagName('title')->item(0)->nodeValue, |
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'desc' => trim(strip_tags($item->getElementsByTagName('description')->item(0)->nodeValue)), |
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'link' => $link, |
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'timestamp' => $timestamp, |
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'img' => $xpath->query('//enclosure/@url')->item(0)->nodeValue, |
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]; |
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} |
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} |
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return $result; |
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} |
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/** |
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* Return array with only unique elements |
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* |
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* @param array $array |
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* |
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* @return array |
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*/ |
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public function getUnique(array $array): array |
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{ |
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$serialized = array_map('serialize', $array); |
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$unique = array_unique($serialized); |
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return array_intersect_key($array, $unique); |
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} |
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/** |
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* @throws \Exception |
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*/ |
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public function getAll(): array |
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{ |
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$result = []; |
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foreach ($this->channels as $chanel) { |
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$result[] = $this->getPostsFromChannel($chanel); |
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} |
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// Merge results from all sources |
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$result = array_merge(...$result); |
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// Only unique records |
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$result = $this->getUnique($result); |
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// Sort array by timestamp column |
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usort($result, static function ($a, $b) { |
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if ($a['timestamp'] === $b['timestamp']) { |
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return 0; |
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} |
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// ASC order |
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return ($a['timestamp'] > $b['timestamp']) ? 1 : -1; |
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}); |
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// Extract IDs and save them all |
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$ids = array_column($result, 'id'); |
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if (count($ids)) { |
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$this->cache->saveIds($ids); |
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} |
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// Slice last few posts if limit is set |
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if (!empty($this->limit)) { |
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$result = array_slice($result, -$this->limit, $this->limit); |
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} |
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return $result; |
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} |
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} |
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Compolomus /
RssReader
This check looks for calls to methods that do not seem to exist on a given type. It looks for the method on the type itself as well as in inherited classes or implemented interfaces.
This is most likely a typographical error or the method has been renamed.