I get the error in below code, it is strange, why it occurred?

In hook_menu

$items['share/%'] = array(
    'page callback' => 'drupal_get_form',
    'page arguments' => array('ym_alter_sharing_content'),
    'access callback' => 'user_is_logged_in',
    'type' => MENU_CALLBACK,


function ym_alter_sharing_content($form, $form_state) {
  module_load_include('inc', 'node', 'node.pages');
  $form = node_add('share');

  //form_load_include($form_state, 'inc', 'node', 'node.pages');
  return $form;

but it return me:

Fatal error: Call to undefined function node_form_validate()

Where is the problem?

  • Maybe you forgot to include node.pages.inc from node module? that's where node_form_validate() is defined.
    – Mołot
    Jan 8 '14 at 13:39
  • @Mołot I include it module_load_include('inc', 'node', 'node.pages');
    – Yuseferi
    Jan 8 '14 at 13:41
  • 1
    It's because you're trying to include another form into your existing form. You need to use hook_form_alter(). I'm sure you know that already though
    – Clive
    Jan 8 '14 at 13:41
  • 3
    You haven't declared a callback function, you've declared a form and are using drupal_get_form() as your callback. Change your callback to ym_alter_sharing_content() and return node_add('share'); or something like that
    – Clive
    Jan 8 '14 at 13:45
  • 1
    Glad you got it sorted :)
    – Clive
    Jan 8 '14 at 13:54

Change page callback form drupal_get_form to function, because if you use drupal_get_form in call back it return form and in your function you create another form, it means form in form and make conflict.

$items['share/%'] = array(
    'page callback' => 'ym_alter_sharing_content',
    'access callback' => 'user_is_logged_in',
    'type' => MENU_CALLBACK,
  • Always use form_load_include() in forms. Otherwise you will not load your files when form is cached.
    – milkovsky
    Nov 7 '14 at 9:46

You got the error, because of missing &.

When you're using form_load_include() in hook_form_alter(), make sure you're following the right API syntax which is:

hook_form_alter(&$form, &$form_state, $form_id)

otherwise form_load_include() can't perform alterations of your current state of the form ($form_state).

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