[TYPO3-dev] clear cache from extension

[Steffen Kamper]

Hi devs,

i found a very good working method in the list (long time ago), where 
bernhard described a method to handle cache from extension entries.
I think this is a genious way to do that and want to show you (again).

There is e field in cache_pages that is not used in normal context 
(reg1/reg2) but can used in a special context:
$GLOBALS['TSFE']->page_cache_reg1 = 13;

i took the 13, you can choose any number you want. If this is done e.g. 
begin of extension, all cache-entries are done with reg1=13, so it is very 
easy to delete all extension-related cached pages by
$GLOBALS['TYPO3_DB']->exec_DELETEquery('cache_pages', 'reg1=13');

vg  Steffen