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<?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 / class WP_Locale_Switcher { /* * Locale stack. * * @since 4.7.0 * @access private * @var string[] / private $locales = array(); /* * Original locale. * * @since 4.7.0 * @access private * @var string / private $original_locale; /* * Holds all available languages. * * @since 4.7.0 * @access private * @var array An array of language codes (file names without the .mo extension). / private $available_languages = array(); /* * Constructor. * * Stores the original locale as well as a list of all available languages. * * @since 4.7.0 / public function __construct() { $this->original_locale = is_admin() ? get_user_locale() : get_locale(); $this->available_languages = array_merge( array( 'en_US' ), get_available_languages() ); } /* * Initializes the locale switcher. * * Hooks into the {@see 'locale'} filter to change the locale on the fly. / public function init() { add_filter( '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. * @return bool True on success, false on failure. / public function switch_to_locale( $locale ) { $current_locale = is_admin() ? get_user_locale() : get_locale(); if ( $current_locale === $locale ) { return false; } if ( ! in_array( $locale, $this->available_languages, true ) ) { return false; } $this->locales[] = $locale; $this->change_locale( $locale ); /* * Fires when the locale is switched. * * @since 4.7.0 * * @param string $locale The new locale. / do_action( 'switch_locale', $locale ); return true; } /* * 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->locales ); if ( null === $previous_locale ) { // The stack is empty, bail. return false; } $locale = end( $this->locales ); 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 ); 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->locales ) ) { return false; } $this->locales = array( $this->original_locale ); 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->locales ); } /* * Filters the WordPress install's locale. * * @since 4.7.0 * * @param string $locale The WordPress install's locale. * @return string The locale currently being switched to. / public function filter_locale( $locale ) { $switched_locale = end( $this->locales ); 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 * @access private * * @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 ) { if ( 'default' === $domain ) { continue; } unload_textdomain( $domain ); 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 * @access private * * @global WP_Locale $wp_locale The WordPress date and time locale object. * * @param string $locale The locale to change to. / private function change_locale( $locale ) { // Reset translation availability information. _get_path_to_translation( null, true ); $this->load_translations( $locale ); $GLOBALS['wp_locale'] = new WP_Locale(); /* * Fires when the locale is switched to or restored. * * @since 4.7.0 * * @param string $locale The new locale. */ do_action( 'change_locale', $locale ); } }

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