Club Drupal

  // Return if element or target shouldn't have "simple" tooltip descriptions.

  if (($input_only && !isset($target['#input']))

    // Ignore text_format elements.

    // @see https://www.drupal.org/node/2478339

    || $type === 'text_format'

    // Ignore if the actual element has no #description set.

    || empty($element['#description'])

    // Ignore if the target element already has a "data-toggle" attribute set.

    || !empty($target['#attributes']['data-toggle'])

    // Ignore if the target element is #disabled.

    || isset($target['#disabled'])

    // Ignore if either the actual element or target element has an explicit

    // #smart_description property set to FALSE.

    || (isset($element['#smart_description']) && !$element['#smart_description'])

    || (isset($target['#smart_description']) && !$target['#smart_description'])

    // Ignore if the description is not "simple".

    || !_bootstrap_is_simple_string($element['#description'], $length, $allowed_tags, $html)

  ) {

    // Set the both the actual element and the target element

    // #smart_description property to FALSE.

    $element['#smart_description'] = FALSE;

    $target['#smart_description'] = FALSE;

    return;

  // Default property (on the element itself).

  $property = 'attributes';

  // Add the tooltip to the #label_attributes property for 'checkbox'

  // and 'radio' elements.

  if ($type === 'checkbox' || $type === 'radio') {

    $property = 'label_attributes';

  }

  // Add the tooltip to the #wrapper_attributes property for 'checkboxes'

  // and 'radios' elements.

  elseif ($type === 'checkboxes' || $type === 'radios') {

    $property = 'wrapper_attributes';

  }

  // Add the tooltip to the #input_group_attributes property for elements

  // that have valid input groups set.

  elseif ((!empty($element['#field_prefix']) || !empty($element['#field_suffix'])) && (!empty($element['#input_group']) || !empty($element['#input_group_button']))) {

    $property = 'input_group_attributes';

  }

  // Retrieve the proper attributes array.

  $attributes = &_bootstrap_get_attributes($target, $property);

  // Set the tooltip attributes.

  $attributes['title'] = $allowed_tags !== FALSE ? filter_xss($element['#description'], $allowed_tags) : $element['#description'];

  $attributes['data-toggle'] = 'tooltip';

  if ($html || $allowed_tags === FALSE) {

    $attributes['data-html'] = 'true';

  }

  // Remove the element description so it isn't (re-)rendered later.

  unset($element['#description']);

      // Ensure that the function is not this one (recursive) and exists.

      if ($function !== __FUNCTION__ && function_exists($function)) {