1 locale.module locale_field_language_fallback(&$display_language, $entity, $langcode)

Applies language fallback rules to the fields attached to the given entity.

Core language fallback rules check if fields have a field translation for the requested language code. If so the requested language is returned, otherwise all the fallback candidates are inspected to see if there is a field translation available in another language. By default this is called by locale_field_language_alter(), but this behavior can be disabled by setting the 'locale_field_language_fallback' variable to FALSE.


$display_language: A reference to an array of language codes keyed by field name.

$entity: The entity to be displayed.

$langcode: The language code $entity has to be displayed in.


core/modules/locale/locale.module, line 297
Add language handling functionality and enables the translation of the user interface to languages other than English.


function locale_field_language_fallback(&$display_language, $entity, $langcode) {
  // Lazily init fallback candidates to avoid unnecessary calls.
  $fallback_candidates = NULL;
  $field_languages = array();

  foreach ($display_language as $field_name => $field_language) {
    // If the requested language is defined for the current field use it,
    // otherwise search for a fallback value among the fallback candidates.
    if (isset($entity->{$field_name}[$langcode])) {
      $display_language[$field_name] = $langcode;
    elseif (!empty($entity->{$field_name})) {
      if (!isset($fallback_candidates)) {
        require_once BACKDROP_ROOT . '/core/includes/language.inc';
        $fallback_candidates = language_fallback_get_candidates();
      foreach ($fallback_candidates as $fallback_language) {
        if (isset($entity->{$field_name}[$fallback_language])) {
          $display_language[$field_name] = $fallback_language;