drupal - Node edit form: edit or new state? -

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what's best way of figuring out if node form in create new node state or edit existing node state?

is there in $form array or have kludge arg()?

are asking node edit form? if so, can either following:

if (empty($form['nid']['#value'])) {   // in add form } else {   // in edit form }

or...

if (arg(1) == "add") {   // in add form... } else {   // in edit form... }

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