language.api.php

<?php
/**
 * @file
 * Hooks provided by the Language module.
 */

/**
 * @addtogroup hooks
 * @{
 */

/**
 * React to a language about to be added or updated in the system.
 *
 * @param $language
 *   A language object.
 */
function hook_language_presave($language) {
  if ($language->default) {
    // React to a new default language.
    example_new_default_language($language);
  }
}

/**
 * React to a language that was just added to the system.
 *
 * @param $language
 *   A language object.
 */
function hook_language_insert($language) {
  example_refresh_permissions();
}

/**
 * React to a language that was just updated in the system.
 *
 * @param $language
 *   A language object.
 */
function hook_language_update($language) {
  example_refresh_permissions();
}

/**
 * Allow modules to react before the deletion of a language.
 *
 * @param $language
 *   The language object of the language that is about to be deleted.
 */
function hook_language_delete($language) {
  // On nodes with this language, unset the language
  db_update('node')
    ->fields(array('language' => ''))
    ->condition('language', $language->langcode)
    ->execute();
}

/**
 * @} End of "addtogroup hooks".
 */