How can I tap into onUserDelete?

Question

I'm currently building a plugin that uses a table that contains rows with an 'active' field set to 1.

If an admin deletes a user from the system, I want to change this value to 0.

I found an 'onUserDelete' event documented but can't work out where or how to use it.

Any help would be greatly appreciated!

EDIT UPDATED:

I now have this code in the init() function of my plugin controller but deleting a user does not seem to fire the code:

    parent::init();

    craft()->on('users.onDeleteUser', function(Event $event) {
        $user = $event->params['user'];

        $userId = $user->id; // ???????

        $craft->memberships_membership->cancelMembershipById($userId);
    });

Any ideas?

Answer 1

From the documentation on events, they follow this pattern:

craft()->on('component.eventName', function(Event $event) {
    // ...
});

So in your example, it'd be something like this and you'd want to add it to your plugin's init() method in the main plugin class.

public function init()
{
    parent::init();

    craft()->on('users.onDeleteUser', function(Event $event) {
        $user = $event->params['user'];
        $userToTransferContentTo = $event->params['transferContentTo']
    });
}

The full list of available events and the parameters they have can be found here.