The clean function with CLEANING_MODE_MATCHING_TAG and CLEANING_MODE_NOT_:MATCHING_TAG with File Backend does not work as expected. I think i found a logical problem in this class.

Example:

$cache->save($huge_data, 'myUniqueID', array('tagA', 'tagB', 'tagC'));
$cache->clean(Zend_Cache::CLEANING_MODE_MATCHING_TAG, array('tagX', 'tagC'));

My logic says that the cache wit id 'myUniqueID' should be cleared. But try it out. It will not be deleted If the first of the tags will not be found the hole entry will not be deleted in the backend.

So i changed the following here in file Zend/Cache/Backend/File.php from line 508 to 531

                    case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
                        $matching = false;
                        foreach ($tags as $tag) {
                            if (in_array($tag, $metadatas['tags'])) {
                                $matching = true;
                                break;
                            }
                        }
                        if ($matching) {
                            $result = ($result) && ($this->remove($id));
                        }
                        break;
                    case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
                        $matching = true;
                        foreach ($tags as $tag) {
                            if (in_array($tag, $metadatas['tags'])) {
                                $matching = false;
                                break;
                            }
                        }
                        if ($matching) {
                            $result = ($result) && $this->remove($id);
                        }                       
                        break;

After changing this the function works as expected.

a third parameter to the clean function would be fine to affect if AND or OR is used by CLEANING_MODE_MATCHING_TAG and CLEANING_MODE_NOT_MATCHING_TAG