如何删除命名会话

I'm using named sessions to store variables for a multi-page form like this:

$_SESSION['pages'][0]
$_SESSION['pages'][1]

If I want to unset all the variables in $_SESSION['pages'][1] and I use session_unset(); it clears all the variables in both of them.

I know I can unset variables one by one using:

unset($_SESSION['pages'][1]['email'])

But I'm looking for a way to delete all of $_SESSION['pages'][1] while leaving $_SESSION['pages'][0] intact

You can use unset on $_SESSION['pages'][1], it's just a normal Array.

unset($_SESSION['pages'][1]);