Drupal coder: hook_form: is this node new ?

hook_form is used both for adding new nodes and editing existing ones, and no parameter is passed to describe the current operation.

Why is it not needed ? Because a simple test can show whether the node is being added or edited:

<?php isset($node) && isset($node->nid) ?>

If the test succeeds, the node has already been created and someone is editing it. Otherwise, it is being created. This can be important for node modules generating values beyond $node->nid for the nodes they handle.

Tagged for drupal, hook_form.