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