/Drupal 8

public function FormValidatorInterface::validateForm

public FormValidatorInterface::validateForm($form_id, &$form, FormStateInterface &$form_state)

Validates user-submitted form data in the $form_state.


$form_id: A unique string identifying the form for validation, submission, theming, and hook_form_alter functions.

$form: An associative array containing the structure of the form, which is passed by reference. Form validation handlers are able to alter the form structure (like #process and #after_build callbacks during form building) in case of a validation error. If a validation handler alters the form structure, it is responsible for validating the values of changed form elements in $form_state->getValues() to prevent form submit handlers from receiving unvalidated values.

$form_state: The current state of the form. The current user-submitted data is stored in $form_state->getValues(), though form validation functions are passed an explicit copy of the values for the sake of simplicity. Validation handlers can also use $form_state to pass information on to submit handlers. For example: $form_state->set('data_for_submission', $data); This technique is useful when validation requires file parsing, web service requests, or other expensive requests that should not be repeated in the submission step.


core/lib/Drupal/Core/Form/FormValidatorInterface.php, line 50


Provides an interface for validating form submissions.




public function validateForm($form_id, &$form, FormStateInterface &$form_state);

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