function drupal_get_form

Processes a form array and produces the HTML output of a form. If there is input in the $_POST['edit'] variable, this function will attempt to validate it, using drupal_validate_form(), and then submit the form using drupal_submit_form().

Parameters

$form_id: A unique string identifying the form. Allows each form to be themed. Pass NULL to suppress the form_id parameter (produces a shorter URL with method=get)

$form: An associative array containing the structure of the form.

$callback: An optional callback that will be used in addition to the form_id.

Related topics

File

includes/form.inc, line 60

Code

function drupal_get_form($form_id, &$form, $callback = NULL) {
  global $form_values, $form_submitted, $user, $form_button_counter;
  static $saved_globals = array();

  // Save globals in case of indirect recursive call
  array_push($saved_globals, array(
    $form_values,
    $form_submitted,
    $form_button_counter,
  ));
  $form_values = array();
  $form_submitted = FALSE;
  $form_button_counter = array(
    0,
    0,
  );
  $form['#type'] = 'form';

  // Add a token to any form displayed to authenticated users.
  // This ensures that any submitted form was actually requested previously by the user to protect against
  // cross site request forgeries. The default token can be bypassed by setting $form['#token'] to FALSE.
  if (isset($form['#token'])) {
    if ($form['#token'] === FALSE || $user->uid == 0) {
      unset($form['#token']);
    }
    else {
      $form['form_token'] = array(
        '#type' => 'token',
        '#default_value' => drupal_get_token($form['#token']),
      );
    }
  }
  else {
    if ($user->uid) {
      $form['#token'] = $form_id;
      $form['form_token'] = array(
        '#id' => 'edit-' . str_replace('_', '-', $form_id) . '-form-token',
        '#type' => 'token',
        '#default_value' => drupal_get_token($form['#token']),
      );
    }
  }
  if (isset($form_id)) {
    $form['form_id'] = array(
      '#type' => 'hidden',
      '#value' => $form_id,
      '#id' => str_replace('_', '-', "edit-{$form_id}"),
    );
  }
  if (!isset($form['#id'])) {
    $form['#id'] = $form_id;
  }
  $form += _element_info('form');
  if (!isset($form['#validate'])) {
    if (function_exists($form_id . '_validate')) {
      $form['#validate'] = array(
        $form_id . '_validate' => array(),
      );
    }
    elseif (function_exists($callback . '_validate')) {
      $form['#validate'] = array(
        $callback . '_validate' => array(),
      );
    }
  }
  if (!isset($form['#submit'])) {
    if (function_exists($form_id . '_submit')) {

      // we set submit here so that it can be altered but use reference for
      // $form_values because it will change later
      $form['#submit'] = array(
        $form_id . '_submit' => array(),
      );
    }
    elseif (function_exists($callback . '_submit')) {
      $form['#submit'] = array(
        $callback . '_submit' => array(),
      );
    }
  }
  foreach (module_implements('form_alter') as $module) {
    $function = $module . '_form_alter';
    $function($form_id, $form);
  }
  $form = form_builder($form_id, $form);
  if (!empty($_POST['edit']) && ($_POST['edit']['form_id'] == $form_id || $_POST['edit']['form_id'] == $callback)) {
    drupal_validate_form($form_id, $form, $callback);

    // IE does not send a button value when there is only one submit button (and no non-submit buttons)
    // and you submit by pressing enter.
    // In that case we accept a submission without button values.
    if (($form_submitted || !$form_button_counter[0] && $form_button_counter[1]) && !form_get_errors()) {
      $redirect = drupal_submit_form($form_id, $form, $callback);
      if (isset($redirect)) {
        $goto = $redirect;
      }
      if (isset($form['#redirect'])) {
        $goto = $form['#redirect'];
      }
      if ($goto !== FALSE) {
        if (is_array($goto)) {
          call_user_func_array('drupal_goto', $goto);
        }
        elseif (!isset($goto)) {
          drupal_goto($_GET['q']);
        }
        else {
          drupal_goto($goto);
        }
      }
    }
  }

  // Don't override #theme if someone already set it.
  if (!isset($form['#theme'])) {
    if (theme_get_function($form_id)) {
      $form['#theme'] = $form_id;
    }
    elseif (theme_get_function($callback)) {
      $form['#theme'] = $callback;
    }
  }
  if (isset($form['#pre_render'])) {
    foreach ($form['#pre_render'] as $function) {
      if (function_exists($function)) {
        $function($form_id, $form);
      }
    }
  }
  $output = form_render($form);

  // Restore globals
  list($form_values, $form_submitted, $form_button_counter) = array_pop($saved_globals);
  return $output;
}