Cache::clearPageCache() 

\nn\t3::Cache()->clearPageCache($pid = NULL); 

Deletes the page cache. Alias to \nn\t3::Page()->clearCache()

\nn\t3::Cache()->clearPageCache( 17 ); // Delete page cache for pid=17
\nn\t3::Cache()->clearPageCache(); // clear cache of ALL pages
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@param mixed $pid pid of the page whose cache is to be cleared or leave empty for all pages
@return void

Source Code 

public function clearPageCache( $pid = null )
{
	return \nn\t3::Page()->clearCache( $pid );
}
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