Validates form submissions from the Form API

This function can be named anything you want (or can be considered optional). If named the same thing as the form callback, it will be utilized automatically. For example, if you form is named my_form, then if you have a validate function named my_form_validate, it will be called automatically.

Since $form_state is passed by reference, you may make changes to this array, and those changes will carry through to other validate functions (defined with #validate_handlers) and then to the submit handler(s).

See also

hook_submit($form, &$form_state)

File

includes/hook.api.php, line 392

Lists all available hooks within FlightPath's core code.

Code

function hook_validate($form, &$form_state) {
  $age = $form_state ["values"]["age"];
  if ($age < 18) {
    form_error("age", "Sorry, you must be 18 or older to submit this form.");
    return;
  }
}