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flatpress/fp-includes/smarty-4.4.1/docs/programmers/api-variables/variable-cache-lifetime.md
Fraenkiman e544ed6d9a Smatry Release 4.4.1 on Feb-2024 
Comparing changes: https://github.com/smarty-php/smarty/compare/v4.3.1...v4.4.1

It is noticeable that Smarty 4.3.1 does not officially support PHP 8.3. Is only supported with 4.4.0.

Remark:

During tests with Smarty 4.5.1, it was noticed that the following warning occurs:
Deprecated: Using the unregistered function "function_exists" in a template is deprecated and will be removed in a future version. Use Smarty::registerPlugin to explicitly register a custom modifier.

As of Smarty 5.X.X, templates must be revised again.
The Smarty release 5.0.2 is already officially available. However, integration into FlatPress is not entirely trivial.
2024-04-14 18:37:39 +02:00

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$cache_lifetime

This is the length of time in seconds that a template cache is valid. Once this time has expired, the cache will be regenerated.

  • $caching must be turned on (either Smarty::CACHING_LIFETIME_CURRENT or Smarty::CACHING_LIFETIME_SAVED) for $cache_lifetime to have any purpose.

  • A $cache_lifetime value of -1 will force the cache to never expire.

  • A value of 0 will cause the cache to always regenerate (good for testing only, to disable caching a more efficient method is to set $caching = Smarty::CACHING_OFF).

  • If you want to give certain templates their own cache lifetime, you could do this by setting $caching = Smarty::CACHING_LIFETIME_SAVED, then set $cache_lifetime to a unique value just before calling display() or fetch().

If $force_compile is enabled, the cache files will be regenerated every time, effectively disabling caching. You can clear all the cache files with the clear_all_cache() function, or individual cache files (or groups) with the clear_cache() function.