Drupal 7: programmatically create a content type with fields (+ migrate node title to a field title & enable entity translation)

install

  // Does the content type already exits?
  $type = node_type_load('book');
  if (!$type) {
    $type = array(
      'type' => 'book',
      'name' => t('Book'),
      'base' => 'node_content',
      'description' => t('Create a book.'),
      'custom' => 1,
      'modified' => 1,
      'locked' => 0,
    );

    // Save the content type.
    $type = node_type_set_defaults($type);
    node_type_save($type);

    // Enable entity translation for this content type.
    variable_set('language_content_type_book', 4);

    // Migrate the default node title to a title field.
    if (title_field_replacement_toggle('node', 'book', 'title')) {
      title_field_replacement_batch_set('node', 'book', 'title');
    }

    // Add a summary field.
    $field = array(
      'field_name' => 'book_summary',
      'type' => 'text',
      'translatable' => TRUE,
    );
    field_create_field($field);

    // Add a summary instance.
    $instance = array(
      'field_name' => 'book_summary',
      'entity_type' => 'node',
      'bundle' => 'book',
      'label' => t('Summary'),
      'description' => t('Add a summary'),
      'widget' => array('type' => 'text_textfield'),
    );
    field_create_instance($instance);
  }