PressBooks\Modules\Export\WordPress\VanillaWxr::convert PHP Метод

    function convert()
    {
        // Get WXR
        $output = $this->queryWxr();
        if (!$output) {
            return false;
        }
        // use error handling to fetch error information as needed
        libxml_use_internal_errors(true);
        $dom = new \DOMDocument();
        $dom->preserveWhiteSpace = false;
        $dom->recover = true;
        // Try to parse non-well formed documents
        $success = $dom->loadXML($output, LIBXML_NOBLANKS | LIBXML_NOENT | LIBXML_NONET | LIBXML_XINCLUDE | LIBXML_NOERROR | LIBXML_NOWARNING);
        // replace custom post_type
        // attempting to import custom post types such as 'chapter',
        // 'part', 'front-matter', 'back-matter' fails in a vanilla WP installation
        $post_type = $dom->getElementsByTagName('post_type');
        // check for errors
        if (!$success) {
            throw new \Exception(print_r(libxml_get_errors(), true));
        }
        for ($i = 0; $i < $post_type->length; $i++) {
            switch ($post_type->item($i)->nodeValue) {
                case 'chapter':
                    $post_type->item($i)->nodeValue = 'post';
                    break;
                case 'front-matter':
                    $post_type->item($i)->nodeValue = 'post';
                    break;
                case 'back-matter':
                    $post_type->item($i)->nodeValue = 'post';
                    break;
                case 'part':
                    $post_type->item($i)->nodeValue = 'post';
                    break;
                default:
                    break;
            }
        }
        // git rid of wp:term declaratation
        // PB generated taxonomy terms don't make it into a vanilla WP installation
        $term = $dom->getElementsByTagName('term');
        // when you remove a child node, the next node becomes the first one,
        // hence '$term->item(0)' and NOT '$term->item($i)'
        $length = $term->length;
        for ($i = 0; $i < $length; $i++) {
            $this->deleteNode($term->item(0));
        }
        //clean up whitespace
        $dom->formatOutput = true;
        // replace category domain, and nicename attributes
        // easier to manipulate the value of attributes with SimpleXML
        $xml = simplexml_import_dom($dom);
        unset($dom);
        // sanity
        if (!$xml) {
            throw new \Exception(print_r(libxml_get_errors(), true));
        }
        $category = $xml->xpath('/rss/channel/item/category');
        foreach ($category as $uncategorize) {
            switch ((string) $uncategorize->attributes()->domain) {
                case 'front-matter-type':
                    $uncategorize->attributes()->domain = 'category';
                    $uncategorize->attributes()->nicename = 'uncategorized';
                    break;
                case 'back-matter-type':
                    $uncategorize->attributes()->domain = 'category';
                    $uncategorize->attributes()->nicename = 'uncategorized';
                    break;
                case 'chapter-type':
                    $uncategorize->attributes()->domain = 'category';
                    $uncategorize->attributes()->nicename = 'uncategorized';
                    break;
                default:
                    break;
            }
        }
        // convert back to xml string
        $output = $xml->asXML();
        // save wxr as file in exports folder
        $filename = $this->timestampedFileName('._vanilla.xml');
        file_put_contents($filename, $output);
        $this->outputPath = $filename;
        return true;
    }