I've never tried to delete a setting before, chances are you'd need to use sql to remove the setting .... might be worth trying "NULL" as a value though ;)

¥

Thanks :)
Here is another question, why does my_param still there after I delete the blog?

Probably because it's not a default param, I guess the core only deletes expected params, sounds like a great post to make in the bugs forum huh? ;)

¥

I'll try with NULL. Sure it would be cool to see $Blog->delete( 'my_param' ) available in next releases.

Swift update, this *might* work ( see inc/settings/model/_abstractsettings.class.php approx 500 onwards ) :

$Blog->CollectionSettings->delete( 'my_param' );

¥

Undefined offset: 1 in ... inc\settings\model\_abstractsettings.class.php on line 517

Do I have to send my_param as array, right?

Never mind I'll use sql instead :)

A wise move ;)

¥

To whom it may concern :roll:

$DB->query('
			DELETE FROM T_coll_settings
			WHERE cset_coll_ID = '.$Blog->ID.'
			AND cset_name = "my_param" ');