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Edit File: class-wp-locale-switcher.php
<?php /** * Locale API: WP_Locale_Switcher class * * @package WordPress * @subpackage i18n * @since 4.7.0 */ /** * Core class used for switching locales. * * @since 4.7.0 */ #[AllowDynamicProperties] class WP_Locale_Switcher { /** * Locale switching stack. * * @since 6.2.0 * @var array */ private $stack = array(); /** * Original locale. * * @since 4.7.0 * @var string */ private $original_locale; /** * Holds all available languages. * * @since 4.7.0 * @var string[] An array of language codes (file names without the .mo extension). */ private $available_languages; /** * Constructor. * * Stores the original locale as well as a list of all available languages. * * @since 4.7.0 */ public function __construct() { $this->original_locale = determine_locale(); $this->available_languages = array_merge( array( 'en_US' ), get_available_languages() ); } /** * Initializes the locale switcher. * * Hooks into the {@see 'locale'} and {@see 'determine_locale'} filters * to change the locale on the fly. * * @since 4.7.0 */ public function init() { add_filter( 'locale', array( $this, 'filter_locale' ) ); add_filter( 'determine_locale', array( $this, 'filter_locale' ) ); } /** * Switches the translations according to the given locale. * * @since 4.7.0 * * @param string $locale The locale to switch to. * @param int|false $user_id Optional. User ID as context. Default false. * @return bool True on success, false on failure. */ public function switch_to_locale( $locale, $user_id = false ) { $current_locale = determine_locale(); if ( $current_locale === $locale ) { return false; } if ( ! in_array( $locale, $this->available_languages, true ) ) { return false; } $this->stack[] = array( $locale, $user_id ); $this->change_locale( $locale ); /** * Fires when the locale is switched. * * @since 4.7.0 * @since 6.2.0 The `$user_id` parameter was added. * * @param string $locale The new locale. * @param false|int $user_id User ID for context if available. */ do_action( 'switch_locale', $locale, $user_id ); return true; } /** * Switches the translations according to the given user's locale. * * @since 6.2.0 * * @param int $user_id User ID. * @return bool True on success, false on failure. */ public function switch_to_user_locale( $user_id ) { $locale = get_user_locale( $user_id ); return $this->switch_to_locale( $locale, $user_id ); } /** * Restores the translations according to the previous locale. * * @since 4.7.0 * * @return string|false Locale on success, false on failure. */ public function restore_previous_locale() { $previous_locale = array_pop( $this->stack ); if ( null === $previous_locale ) { // The stack is empty, bail. return false; } $entry = end( $this->stack ); $locale = is_array( $entry ) ? $entry[0] : false; if ( ! $locale ) { // There's nothing left in the stack: go back to the original locale. $locale = $this->original_locale; } $this->change_locale( $locale ); /** * Fires when the locale is restored to the previous one. * * @since 4.7.0 * * @param string $locale The new locale. * @param string $previous_locale The previous locale. */ do_action( 'restore_previous_locale', $locale, $previous_locale[0] ); return $locale; } /** * Restores the translations according to the original locale. * * @since 4.7.0 * * @return string|false Locale on success, false on failure. */ public function restore_current_locale() { if ( empty( $this->stack ) ) { return false; } $this->stack = array( array( $this->original_locale, false ) ); return $this->restore_previous_locale(); } /** * Whether switch_to_locale() is in effect. * * @since 4.7.0 * * @return bool True if the locale has been switched, false otherwise. */ public function is_switched() { return ! empty( $this->stack ); } /** * Returns the locale currently switched to. * * @since 6.2.0 * * @return string|false Locale if the locale has been switched, false otherwise. */ public function get_switched_locale() { $entry = end( $this->stack ); if ( $entry ) { return $entry[0]; } return false; } /** * Returns the user ID related to the currently switched locale. * * @since 6.2.0 * * @return int|false User ID if set and if the locale has been switched, false otherwise. */ public function get_switched_user_id() { $entry = end( $this->stack ); if ( $entry ) { return $entry[1]; } return false; } /** * Filters the locale of the WordPress installation. * * @since 4.7.0 * * @param string $locale The locale of the WordPress installation. * @return string The locale currently being switched to. */ public function filter_locale( $locale ) { $switched_locale = $this->get_switched_locale(); if ( $switched_locale ) { return $switched_locale; } return $locale; } /** * Load translations for a given locale. * * When switching to a locale, translations for this locale must be loaded from scratch. * * @since 4.7.0 * * @global Mo[] $l10n An array of all currently loaded text domains. * * @param string $locale The locale to load translations for. */ private function load_translations( $locale ) { global $l10n; $domains = $l10n ? array_keys( $l10n ) : array(); load_default_textdomain( $locale ); foreach ( $domains as $domain ) { // The default text domain is handled by `load_default_textdomain()`. if ( 'default' === $domain ) { continue; } /* * Unload current text domain but allow them to be reloaded * after switching back or to another locale. */ unload_textdomain( $domain, true ); get_translations_for_domain( $domain ); } } /** * Changes the site's locale to the given one. * * Loads the translations, changes the global `$wp_locale` object and updates * all post type labels. * * @since 4.7.0 * * @global WP_Locale $wp_locale WordPress date and time locale object. * @global PHPMailer\PHPMailer\PHPMailer $phpmailer * * @param string $locale The locale to change to. */ private function change_locale( $locale ) { global $wp_locale, $phpmailer; $this->load_translations( $locale ); $wp_locale = new WP_Locale(); WP_Translation_Controller::get_instance()->set_locale( $locale ); if ( $phpmailer instanceof WP_PHPMailer ) { $phpmailer->SetLanguage(); } /** * Fires when the locale is switched to or restored. * * @since 4.7.0 * * @param string $locale The new locale. */ do_action( 'change_locale', $locale ); } }