[TYPO3-dev] clear specified cache_pagesection

[Steffen Kamper]

Hi,

how do i clear a specific entry from page_section having page id and 
GET-vars?

I see
$pagesections = $GLOBALS['typo3CacheManager']->getCache(
	'cache_pagesection'
);

but then i get all and i have to iterate.

There is also flushCachesByTag($tag), but how to calculate the $tag?

vg Steffen