upgrade_strings example

$start_time = time();

        $defaults    = array(
            'pre_check_md5'                => true,
            'attempt_rollback'             => false,
            'do_rollback'                  => false,
            'allow_relaxed_file_ownership' => false,
        );
        $parsed_args = wp_parse_args( $args, $defaults );

        $this->init();
        $this->upgrade_strings();

        // Is an update available?         if ( ! isset( $current->response ) || 'latest' === $current->response ) {
            return new WP_Error( 'up_to_date', $this->strings['up_to_date'] );
        }

        $res = $this->fs_connect( array( ABSPATH, WP_CONTENT_DIR ), $parsed_args['allow_relaxed_file_ownership'] );
        if ( ! $res || is_wp_error( $res ) ) {
            return $res;
        }

        

    public function bulk_upgrade( $language_updates = array(), $args = array() ) {
        global $wp_filesystem;

        $defaults    = array(
            'clear_update_cache' => true,
        );
        $parsed_args = wp_parse_args( $args, $defaults );

        $this->init();
        $this->upgrade_strings();

        if ( ! $language_updates ) {
            $language_updates = wp_get_translation_updates();
        }

        if ( empty( $language_updates ) ) {
            $this->skin->header();
            $this->skin->set_result( true );
            $this->skin->feedback( 'up_to_date' );
            $this->skin->bulk_footer();
            $this->skin->footer();
            

    public function upgrade( $theme, $args = array() ) {
        $defaults    = array(
            'clear_update_cache' => true,
        );
        $parsed_args = wp_parse_args( $args, $defaults );

        $this->init();
        $this->upgrade_strings();

        // Is an update available?         $current = get_site_transient( 'update_themes' );
        if ( ! isset( $current->response[ $theme ] ) ) {
            $this->skin->before();
            $this->skin->set_result( false );
            $this->skin->error( 'up_to_date' );
            $this->skin->after();
            return false;
        }

        

    public function upgrade( $plugin, $args = array() ) {
        $defaults    = array(
            'clear_update_cache' => true,
        );
        $parsed_args = wp_parse_args( $args, $defaults );

        $this->init();
        $this->upgrade_strings();

        $current = get_site_transient( 'update_plugins' );
        if ( ! isset( $current->response[ $plugin ] ) ) {
            $this->skin->before();
            $this->skin->set_result( false );
            $this->skin->error( 'up_to_date' );
            $this->skin->after();
            return false;
        }

        // Get the URL to the zip file.