* : Language code to activate. * * ## EXAMPLES * * $ wp site switch-language ja * Success: Language activated. * * @throws WP_CLI\ExitException */ public function __invoke( $args, $assoc_args ) { list( $language_code ) = $args; $available = $this->get_installed_languages(); if ( ! in_array( $language_code, $available, true ) ) { WP_CLI::error( 'Language not installed.' ); } if ( 'en_US' === $language_code ) { $language_code = ''; } if ( get_locale() === $language_code ) { WP_CLI::warning( "Language '{$language_code}' already active." ); return; } update_option( 'WPLANG', $language_code ); WP_CLI::success( 'Language activated.' ); } }