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Package phpcache
Short Description This package contains a tag-based cache (APC only).
License MIT
Homepage https://github.com/joefallon/phpcache
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Informations about the package phpcache
Joe's PHP Cache
By Joe Fallon
Normally, cache entries are invalidated using one of three methods:
- The cache entry is explicitly removed via a call to a
remove()method of some sort. - The cache entry is removed due to time-based expiration.
- The cache entry is removed due to being ejected to make room for newer entries.
Unfortunately, this does not allow a whole group of cache entries to be removed
because they are dependent on a common factor. For example, let's assume we have
a blog and the blog has many posts. Additionally, let's assume that a list of all
of the posts has been added to the cache. Let's set the cache key for the group
of posts to all_posts. Additionally, let's add a tag to this cache entry called
posts_table.
Then, let's say we cache a single post. Let's give it a key of post_id_45. Also,
let's give it a tag of posts_table. So now we have all the posts as a cache
entry and the post with an ID of 45 as a cache entry. If we delete the post with
id of 45, then of course remove it from the cache. However, we should also delete
by tag every cache entry with the tag posts_table. This will remove the list of
all posts from the previous paragraph. There could be many cache entries that are
dependent on the contents of the posts table not changing. Using one or more tags
to clear groups of cache entries make cache management much easier
and less prone to error.
Installation
The easiest way to install Joe's PHP Cache is with
Composer. Create the following composer.json file
and run the php composer.phar install command to install it.
TaggedCache Class
The TaggedCache class allows the usage of simple key/value cache as a cache
back-end. In fact, any class that implements Cacheable can be used as a
cache back-end for TaggedCache. Currently, only APC is implemented. However,
it is super easy to add more and I look forward to pull requests.
In addition to tags, TaggedCache supports several additional features:
- The cache can be namespaced to allow more than one cache to be segregated within a back-end.
- A default expires time in seconds is available to allow more aggressive cache expiration than the back-end default expires time. This can be useful for data retrieved from external web services (e.g. feeds).
- Each cache entry can have a custom expires time.
Available Methods
Here is a list of methods available in TaggedCache:
Add and Retrieve a Value From the Cache
Here is an example of adding a plain non-tagged value to the tagged cache:
Add and Remove a Tagged Value From the Cache
Here is an example of adding a cache entry to the cache that has a tag associated with it and then deleting that cache entry by tag instead of by key:
NOTE: In the previous example, all entries that have the tag 'tag2' would be deleted.
