Delete Specific Session Variables

[treeleaf20]

I have code like the following:

$groupName = $_SESSION['groupName'];
$category = $_SESSION['category'];
$Public = $_SESSION['Public'];

Could at some point in the code destroy those specific sections without destroying other sessions. So like if I wanted to destroy $Public and $category but keep $grouName, how would I do that?? Would I do someting like:

session_destroy($category, $Public)

Thanks for the help.

[drew010]

session_destroy is used to delete an entire session, but you can use
unset($SESSION['category']);
unset($SESSION['Public']);
to delete those ones in perticular.
or just
$SESSION['category'] = '';
$SESSION['Public'] = '';