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How can I add an object to a form array to make it available to hook_form_alter() implementations?

I have an object I pass to a form, which may have the new property. I would like to implement hook_form_alter() in another module to add/change form items based on that property.

There is no need for the item to be available after submission. I would like to avoid the overhead of using a value form element.

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You don't have to add the entire object to the $form array: You can just add the property you need to share with the hook_form_alter() implementations, for example with the following code.

$form['#mymodule_new'] = $object->new;

You don't have to worry about adding overhead because the values submitted in a form are transient by design, if they are not stored in the database.

As additional note, $form['#mymodule_new'] is available to form validation and submission handlers. The array key should not be already used by other Drupal modules, including Drupal core modules, to avoid conflicts.

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