得到form 数组 get a $form array for a specific form to edit

/**
redefine all of the processing of drupal_get_form, without the rendering part
**/
function drupal_get_form_array($form_id) {
  $form_state = array('storage' => NULL, 'submitted' => FALSE);
 
  $args = func_get_args();
  $cacheable = FALSE;
 
  if (isset($_SESSION['batch_form_state'])) {
    // We've been redirected here after a batch processing : the form has
    // already been processed, so we grab the post-process $form_state value
    // and move on to form display. See _batch_finished() function.
    $form_state = $_SESSION['batch_form_state'];
    unset($_SESSION['batch_form_state']);
  }
  else {
    // If the incoming $_POST contains a form_build_id, we'll check the
    // cache for a copy of the form in question. If it's there, we don't
    // have to rebuild the form to proceed. In addition, if there is stored
    // form_state data from a previous step, we'll retrieve it so it can
    // be passed on to the form processing code.
    if (isset($_POST['form_id']) && $_POST['form_id'] == $form_id && !empty($_POST['form_build_id'])) {
      $form = form_get_cache($_POST['form_build_id'], $form_state);
    }
 
    // If the previous bit of code didn't result in a populated $form
    // object, we're hitting the form for the first time and we need
    // to build it from scratch.
    if (!isset($form)) {
      $form_state['post'] = $_POST;
      // Use a copy of the function's arguments for manipulation
      $args_temp = $args;
      $args_temp[0] = &$form_state;
      array_unshift($args_temp, $form_id);
 
      $form = call_user_func_array('drupal_retrieve_form', $args_temp);
      $form_build_id = 'form-'. md5(uniqid(mt_rand(), TRUE));
      $form['#build_id'] = $form_build_id;
      drupal_prepare_form($form_id, $form, $form_state);
      // Store a copy of the unprocessed form for caching and indicate that it
      // is cacheable if #cache will be set.
      $original_form = $form;
      $cacheable = TRUE;
      unset($form_state['post']);
    }
    $form['#post'] = $_POST;
 
    // Now that we know we have a form, we'll process it (validating,
    // submitting, and handling the results returned by its submission
    // handlers. Submit handlers accumulate data in the form_state by
    // altering the $form_state variable, which is passed into them by
    // reference.
    drupal_process_form($form_id, $form, $form_state);
    if ($cacheable && !empty($form['#cache'])) {
      // Caching is done past drupal_process_form so #process callbacks can
      // set #cache.
      form_set_cache($form_build_id, $original_form, $form_state);
    }
  }
 
  // Most simple, single-step forms will be finished by this point --
  // drupal_process_form() usually redirects to another page (or to
  // a 'fresh' copy of the form) once processing is complete. If one
  // of the form's handlers has set $form_state['redirect'] to FALSE,
  // the form will simply be re-rendered with the values still in its
  // fields.
  //
  // If $form_state['storage'] or $form_state['rebuild'] has been set
  // and input has been processed, we know that we're in a complex
  // multi-part process of some sort and the form's workflow is NOT
  // complete. We need to construct a fresh copy of the form, passing
  // in the latest $form_state in addition to any other variables passed
  // into drupal_get_form().
 
  if ((!empty($form_state['storage']) || !empty($form_state['rebuild'])) && !empty($form_state['process_input']) && !form_get_errors()) {
    $form = drupal_rebuild_form($form_id, $form_state, $args);
  }
 
  return $form;
}

来自 http://www.trevorsimonton.com/blog/drupal-get-form-array-drupalgetform-not-print-editable