getIdsMatchingTags example

public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
    {
        switch($mode) {
            case Zend_Cache::CLEANING_MODE_ALL:
                $boolFast = $this->_fastBackend->clean(Zend_Cache::CLEANING_MODE_ALL);
                $boolSlow = $this->_slowBackend->clean(Zend_Cache::CLEANING_MODE_ALL);
                return $boolFast && $boolSlow;
                break;
            case Zend_Cache::CLEANING_MODE_OLD:
                return $this->_slowBackend->clean(Zend_Cache::CLEANING_MODE_OLD);
            case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
                $ids = $this->_slowBackend->getIdsMatchingTags($tags);
                $res = true;
                foreach ($ids as $id) {
                    $bool = $this->remove($id);
                    $res = $res && $bool;
                }
                return $res;
                break;
            case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
                $ids = $this->_slowBackend->getIdsNotMatchingTags($tags);
                $res = true;
                foreach ($ids as $id) {
                    

 /* Redis takes care of expire */

        if ($mode == Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG && $tags && (is_string($tags) || count($tags))) {
            return $this->removeTag($tags);
        }

        if ($mode == Zend_Cache::CLEANING_MODE_MATCHING_TAG && $tags && (is_string($tags) || count($tags) == 1)) {
            return $this->removeTag($tags);
        }

        if ($mode == Zend_Cache::CLEANING_MODE_MATCHING_TAG && $tags && count($tags)) {
            return $this->remove($this->getIdsMatchingTags($tags));
        }

        if ($mode == Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG) {
            Zend_Cache::throwException('CLEANING_MODE_NOT_MATCHING_TAG not implemented for Redis cache');
        }

        Zend_Cache::throwException('Invalid mode for clean() method');
    }

    /** * Test if the given cache id is available (and still valid as a cache record) * * @param string $id Cache id * @param bool $doNotTestCacheValidity If set to true, the cache validity won't be tested * * @return bool|mixed false (a cache is not available) or "last modified" timestamp (int) of the available cache record */

$res1 = $this->_query('DELETE FROM cache');
                $res2 = $this->_query('DELETE FROM tag');
                return $res1 && $res2;
                break;
            case Zend_Cache::CLEANING_MODE_OLD:
                $mktime = time();
                $res1 = $this->_query("DELETE FROM tag WHERE id IN (SELECT id FROM cache WHERE expire>0 AND expire<=$mktime)");
                $res2 = $this->_query("DELETE FROM cache WHERE expire>0 AND expire<=$mktime");
                return $res1 && $res2;
                break;
            case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
                $ids = $this->getIdsMatchingTags($tags);
                $result = true;
                foreach ($ids as $id) {
                    $result = $this->remove($id) && $result;
                }
                return $result;
                break;
            case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
                $ids = $this->getIdsNotMatchingTags($tags);
                $result = true;
                foreach ($ids as $id) {
                    $result = $this->remove($id) && $result;
                }

    public function getIdsMatchingTags($tags = [])
    {
        if (!$this->_extendedBackend) {
            Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
        }
        if (!($this->_backendCapabilities['tags'])) {
            Zend_Cache::throwException(self::BACKEND_NOT_SUPPORTS_TAG);
        }

        $ids = $this->_backend->getIdsMatchingTags($tags);

        // we need to remove cache_id_prefix from ids (see #ZF-6178, #ZF-7600)         if (isset($this->_options['cache_id_prefix']) && $this->_options['cache_id_prefix'] !== '') {
            $prefix = &$this->_options['cache_id_prefix'];
            $prefixLen = strlen($prefix);
            foreach ($ids as &$id) {
                if (strpos($id, $prefix) === 0) {
                    $id = substr($id, $prefixLen);
                }
            }
        }