* WordPress Translation Installation Administration API
* @subpackage Administration
* Retrieve translations from WordPress Translation API.
* @param string $type Type of translations. Accepts 'plugins', 'themes', 'core'.
* @param array|object $args Translation API arguments. Optional.
* @return object|WP_Error On success an object of translations, WP_Error on failure.
function translations_api( $type, $args = null ) {
// Include an unmodified $wp_version.
require ABSPATH . WPINC . '/version.php';
if ( ! in_array( $type, array( 'plugins', 'themes', 'core' ), true ) ) {
return new WP_Error( 'invalid_type', __( 'Invalid translation type.' ) );
* Allows a plugin to override the WordPress.org Translation Installation API entirely.
* @param false|object $result The result object. Default false.
* @param string $type The type of translations being requested.
* @param object $args Translation API arguments.
$res = apply_filters( 'translations_api', false, $type, $args );
$url = 'http://api.wordpress.org/translations/' . $type . '/1.0/';
$ssl = wp_http_supports( array( 'ssl' ) );
$url = set_url_scheme( $url, 'https' );
'wp_version' => $wp_version,
'locale' => get_locale(),
'version' => $args['version'], // Version of plugin, theme or core.
if ( 'core' !== $type ) {
$options['body']['slug'] = $args['slug']; // Plugin or theme slug.
$request = wp_remote_post( $url, $options );
if ( $ssl && is_wp_error( $request ) ) {
/* translators: %s: Support forums URL. */
__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
__( 'https://wordpress.org/support/forums/' )
) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
$request = wp_remote_post( $http_url, $options );
if ( is_wp_error( $request ) ) {
'translations_api_failed',
/* translators: %s: Support forums URL. */
__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
__( 'https://wordpress.org/support/forums/' )
$request->get_error_message()
$res = json_decode( wp_remote_retrieve_body( $request ), true );
if ( ! is_object( $res ) && ! is_array( $res ) ) {
'translations_api_failed',
/* translators: %s: Support forums URL. */
__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
__( 'https://wordpress.org/support/forums/' )
wp_remote_retrieve_body( $request )
* Filters the Translation Installation API response results.
* @param object|WP_Error $res Response object or WP_Error.
* @param string $type The type of translations being requested.
* @param object $args Translation API arguments.
return apply_filters( 'translations_api_result', $res, $type, $args );
* Get available translations from the WordPress.org API.
* @see translations_api()
* @return array[] Array of translations, each an array of data, keyed by the language. If the API response results
* in an error, an empty array will be returned.
function wp_get_available_translations() {
if ( ! wp_installing() ) {
$translations = get_site_transient( 'available_translations' );
if ( false !== $translations ) {
// Include an unmodified $wp_version.
require ABSPATH . WPINC . '/version.php';
$api = translations_api( 'core', array( 'version' => $wp_version ) );
if ( is_wp_error( $api ) || empty( $api['translations'] ) ) {
// Key the array with the language code for now.
foreach ( $api['translations'] as $translation ) {
$translations[ $translation['language'] ] = $translation;
if ( ! defined( 'WP_INSTALLING' ) ) {
set_site_transient( 'available_translations', $translations, 3 * HOUR_IN_SECONDS );
* Output the select form for the language selection on the installation screen.
* @global string $wp_local_package Locale code of the package.
* @param array[] $languages Array of available languages (populated via the Translation API).
function wp_install_language_form( $languages ) {
global $wp_local_package;
$installed_languages = get_available_languages();
echo "<label class='screen-reader-text' for='language'>Select a default language</label>\n";
echo "<select size='14' name='language' id='language'>\n";
echo '<option value="" lang="en" selected="selected" data-continue="Continue" data-installed="1">English (United States)</option>';
if ( ! empty( $wp_local_package ) && isset( $languages[ $wp_local_package ] ) ) {
if ( isset( $languages[ $wp_local_package ] ) ) {
$language = $languages[ $wp_local_package ];
'<option value="%s" lang="%s" data-continue="%s"%s>%s</option>' . "\n",
esc_attr( $language['language'] ),
esc_attr( current( $language['iso'] ) ),
esc_attr( $language['strings']['continue'] ? $language['strings']['continue'] : 'Continue' ),
in_array( $language['language'], $installed_languages, true ) ? ' data-installed="1"' : '',
esc_html( $language['native_name'] )
unset( $languages[ $wp_local_package ] );
foreach ( $languages as $language ) {
'<option value="%s" lang="%s" data-continue="%s"%s>%s</option>' . "\n",
esc_attr( $language['language'] ),
esc_attr( current( $language['iso'] ) ),
esc_attr( $language['strings']['continue'] ? $language['strings']['continue'] : 'Continue' ),
in_array( $language['language'], $installed_languages, true ) ? ' data-installed="1"' : '',
esc_html( $language['native_name'] )
echo '<p class="step"><span class="spinner"></span><input id="language-continue" type="submit" class="button button-primary button-large" value="Continue" /></p>';
* Download a language pack.
* @see wp_get_available_translations()
* @param string $download Language code to download.
* @return string|false Returns the language code if successfully downloaded
* (or already installed), or false on failure.
function wp_download_language_pack( $download ) {
// Check if the translation is already installed.
if ( in_array( $download, get_available_languages(), true ) ) {
if ( ! wp_is_file_mod_allowed( 'download_language_pack' ) ) {
// Confirm the translation is one we can download.
$translations = wp_get_available_translations();
foreach ( $translations as $translation ) {
if ( $translation['language'] === $download ) {
$translation_to_load = true;
if ( empty( $translation_to_load ) ) {
$translation = (object) $translation;
require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
$skin = new Automatic_Upgrader_Skin;
$upgrader = new Language_Pack_Upgrader( $skin );
$translation->type = 'core';
$result = $upgrader->upgrade( $translation, array( 'clear_update_cache' => false ) );
if ( ! $result || is_wp_error( $result ) ) {
return $translation->language;
* Check if WordPress has access to the filesystem without asking for
* @return bool Returns true on success, false on failure.
function wp_can_install_language_pack() {
if ( ! wp_is_file_mod_allowed( 'can_install_language_pack' ) ) {
require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
$skin = new Automatic_Upgrader_Skin;
$upgrader = new Language_Pack_Upgrader( $skin );
$check = $upgrader->fs_connect( array( WP_CONTENT_DIR, WP_LANG_DIR ) );
if ( ! $check || is_wp_error( $check ) ) {