public FormBuilderInterface::prepareForm($form_id, &$form, FormStateInterface &$form_state)
Prepares a structured form array.
Adds required elements, executes any hook_form_alter functions, and optionally inserts a validation token to prevent tampering.
string $form_id: A unique string identifying the form for validation, submission, theming, and hook_form_alter functions.
array $form: An associative array containing the structure of the form.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form. Passed in here so that hook_form_alter() calls can use it, as well.
public function prepareForm($form_id, &$form, FormStateInterface &$form_state);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormBuilderInterface.php/function/FormBuilderInterface::prepareForm/8.1.x