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On Drupal 7, I would like to execute some code once a form has been validated.

I have seen many usage of hook_form_FORM_ID_alter : implementing this hook and adding a custom callback to $form['#validate'] I could perform action on validation.

But I need to be absolutely sure the form has been validated to perform my actions.

Is there some other hook to do so ? Or something I could do in hook_form_alter to ensure that ?

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You should add a submit callback instead of a validation callback. Submit callbacks are called after the form has been validated.

function yourmodule_form_FORM_ID_alter(&$form, &$form_state) {
  $form['#submit'][] = 'yourmodule_custom_submit_callback';
}

function yourmodule_custom_submit_callback($form, &$form_state) {
  // Execute here your code
}
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  • Oh! I thought sumbit callbacks were called when the user submit the form. Are you sure about that ? On api.drupal.org/api/drupal/… it says "A list of custom submit functions that will be called when the element is submitted. This is usually to add additional submit functions to a form, or to use an alternate function rather than the default form submission function which is the form ID with _submit appended to it."
    – Eria
    Commented Nov 10, 2017 at 9:43
  • Submit handlers are called after the validation handlers. Otherwise it would have no meaning to validate the form after it is already submitted.
    – Elin Y.
    Commented Nov 10, 2017 at 14:27

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