PressBooks\Modules\Import\Epub\Epub201::parseMetadata PHP Метод

    protected function parseMetadata(\SimpleXMLElement $xml)
    {
        foreach ($xml->metadata->children('dc', true) as $key => $val) {
            $val = (string) $val;
            // Set authors
            if ('creator' == $key && !empty($val)) {
                $this->authors .= trim($val) . ', ';
            } elseif ('contributor' == $key && !empty($val)) {
                $this->authors .= trim($val) . ', ';
            }
        }
        // Get rid of trailing comma
        $this->authors = rtrim($this->authors, ', ');
    }