Thank Dan and Sivaji

I know of what you said, but i still can`t understand the code below:

function node_example_form(&$node) {

  $type = node_get_types('type', $node);

  if ($type->has_title) {

    $form['title'] = array(
      '#type' => 'textfield',

      '#title' => check_plain($type->title_label),

      '#required' => TRUE,
      '#default_value' => $node->title,

      '#weight' => -5
    );
  }
see http://api.drupal.org/api/file/developer/examples/node_example.module/6/source

there $type is a object, how to explain it,how to understand it