cache

(Since TYPO3 4.7) Stores the rendered content into the caching framework and reads it from there. This allows you to reuse this content without prior rendering. The presence of “cache.key” will trigger this feature. It is evaluated twice:

  • Content is read from cache directly after the stdWrapPreProcess hook and before “setContentToCurrent”. If there is a cache entry for the given cache key, stdWrap processing will stop and the cached content will be returned. If no cache content is found for this key, the stdWrap processing continues as usual.
  • Writing to cache happens at the end of rendering, directly before the stdWrapPostProcess hook is called and before the “debug*” functions. The rendered content will be stored in the cache, if cache.key was set. The configuration options cache.tags and cache.lifetime allow to control the caching.

Note: This feature relies on the caching framework, which needs to be enabled for this feature to work. Otherwise content will not be cached, but rendered on every call.

Property

key

Data type

string /stdWrap

Description

The cache identifier that is used to store the rendered content into the cache and to read it from there.

Note: Make sure to use a valid cache identifier. Also take care to choose a cache key that is accurate enough to distinguish different versions of the rendered content while being generic enough to stay efficient.

Property

lifetime

Data type

mixed /stdWrap

Description

Lifetime of the content in cache.

Allows you to determine the lifetime of the cached object independently of the lifetime of the cached version of the page on which it is used.

Possible values are any positive integer and the keywords “unlimited” and “default”:

integer: Lifetime in seconds.

“unlimited”: Cached content will not expire unless actively purged by id or by tag or if the complete cache is flushed.

“default”: The default cache lifetime as configured in config.cache_period is used.

Default

default

Property

tags

Data type

string /stdWrap

Description

Can hold a comma-separated list of tags. These tags will be attached to the cached content into the cache_hash storage (not into cache_pages) and can be used to purge the cached content.

[tsref:->cache]

Examples:

5 = TEXT
5 {
  stdWrap.cache.key = mycurrenttimestamp
  stdWrap.cache.tags = tag_a,tag_b,tag_c
  stdWrap.cache.lifetime = 3600
  stdWrap.data = date : U
  stdWrap.strftime = %H:%M:%S
}

In the above example the current time will be cached with the key “mycurrenttimestamp”. This key is fixed and does not take the current page id into account. So if you add this to your TypoScript, the cObject will be cached and reused on all pages (showing you the same timestamp).

5 = TEXT
5 {
  stdWrap.cache.key = mycurrenttimestamp_{page:uid}_{TSFE:sys_language_uid}
  stdWrap.cache.key.insertData = 1
}

Here a dynamic key is used. It takes the page id and the language uid into account making the object page and language specific.