Pressbooks\Modules\ThemeOptions\PDFOptions::doInitialUpgrade PHP Метод

    function doInitialUpgrade()
    {
        $_option = $this->getSlug();
        $options = get_option('pressbooks_theme_options_' . $_option, $this->defaults);
        // Replace pdf_page_size with pdf_page_width and pdf_page_height
        if (isset($options['pdf_page_size'])) {
            switch ($options['pdf_page_size']) {
                case 1:
                    $options['pdf_page_width'] = '5.5in';
                    $options['pdf_page_height'] = '8.5in';
                    break;
                case 2:
                    $options['pdf_page_width'] = '6in';
                    $options['pdf_page_height'] = '9in';
                    break;
                case 3:
                    $options['pdf_page_width'] = '8.5in';
                    $options['pdf_page_height'] = '11in';
                    break;
                case 4:
                    $options['pdf_page_width'] = '8.5in';
                    $options['pdf_page_height'] = '9.25in';
                    break;
                case 5:
                    $options['pdf_page_width'] = '5in';
                    $options['pdf_page_height'] = '7.75in';
                    break;
                case 6:
                    $options['pdf_page_width'] = '4.25in';
                    $options['pdf_page_height'] = '7in';
                    break;
                case 7:
                    $options['pdf_page_width'] = '21cm';
                    $options['pdf_page_height'] = '29.7cm';
                    break;
                case 8:
                    $options['pdf_page_width'] = '14.8cm';
                    $options['pdf_page_height'] = '21cm';
                    break;
                case 9:
                    $options['pdf_page_width'] = '5in';
                    $options['pdf_page_height'] = '8in';
                    break;
                default:
                    $options['pdf_page_width'] = '5.5in';
                    $options['pdf_page_height'] = '8.5in';
            }
            unset($options['pdf_page_size']);
        }
        // Substitute human-readable values
        if (!isset($options['pdf_paragraph_separation']) || '1' == $options['pdf_paragraph_separation']) {
            $options['pdf_paragraph_separation'] = 'indent';
        } elseif ('2' == $options['pdf_paragraph_separation']) {
            $options['pdf_paragraph_separation'] = 'skiplines';
        }
        if (!isset($options['pdf_blankpages']) || '1' == $options['pdf_blankpages']) {
            $options['pdf_blankpages'] = 'include';
        } elseif ('2' == $options['pdf_blankpages']) {
            $options['pdf_blankpages'] = 'remove';
        }
        if (!isset($options['pdf_footnotes_style']) || '1' == $options['pdf_footnotes_style']) {
            $options['pdf_footnotes_style'] = 'footnotes';
        } elseif ('2' == $options['pdf_footnotes_style']) {
            $options['pdf_footnotes_style'] = 'endnotes';
        }
        // Add missing defaults.
        foreach ($this->defaults as $key => $value) {
            if (!isset($options[$key])) {
                $options[$key] = $value;
            }
        }
        update_option('pressbooks_theme_options_' . $_option, $options);
    }