Meta.php

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<?php
class PHPExcel_Writer_OpenDocument_Meta extends PHPExcel_Writer_OpenDocument_WriterPart
{
    public function write(PHPExcel $pPHPExcel = null)
    {
        if (!$pPHPExcel) {
            $pPHPExcel = $this->getParentWriter()->getPHPExcel();
        }
 
        $objWriter = null;
        if ($this->getParentWriter()->getUseDiskCaching()) {
            $objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
        } else {
            $objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_MEMORY);
        }
 
        // XML header
        $objWriter->startDocument('1.0', 'UTF-8');
 
        // Meta
        $objWriter->startElement('office:document-meta');
            $objWriter->writeAttribute('xmlns:office', 'urn:oasis:names:tc:opendocument:xmlns:office:1.0');
            $objWriter->writeAttribute('xmlns:xlink', 'http://www.w3.org/1999/xlink');
            $objWriter->writeAttribute('xmlns:dc', 'http://purl.org/dc/elements/1.1/');
            $objWriter->writeAttribute('xmlns:meta', 'urn:oasis:names:tc:opendocument:xmlns:meta:1.0');
            $objWriter->writeAttribute('xmlns:ooo', 'http://openoffice.org/2004/office');
            $objWriter->writeAttribute('xmlns:grddl', 'http://www.w3.org/2003/g/data-view#');
            $objWriter->writeAttribute('office:version', '1.2');
 
            $objWriter->startElement('office:meta');
                $objWriter->writeElement('meta:initial-creator', $pPHPExcel->getProperties()->getCreator());
                $objWriter->writeElement('dc:creator', $pPHPExcel->getProperties()->getCreator());
                $objWriter->writeElement('meta:creation-date', date(DATE_W3C, $pPHPExcel->getProperties()->getCreated()));
                $objWriter->writeElement('dc:date', date(DATE_W3C, $pPHPExcel->getProperties()->getCreated()));
                $objWriter->writeElement('dc:title', $pPHPExcel->getProperties()->getTitle());
                $objWriter->writeElement('dc:description', $pPHPExcel->getProperties()->getDescription());
                $objWriter->writeElement('dc:subject', $pPHPExcel->getProperties()->getSubject());
                $keywords = explode(' ', $pPHPExcel->getProperties()->getKeywords());
                foreach ($keywords as $keyword) {
                    $objWriter->writeElement('meta:keyword', $keyword);
                }
                //<meta:document-statistic meta:table-count="XXX" meta:cell-count="XXX" meta:object-count="XXX"/>
                $objWriter->startElement('meta:user-defined');
                    $objWriter->writeAttribute('meta:name', 'Company');
                    $objWriter->writeRaw($pPHPExcel->getProperties()->getCompany());
                $objWriter->endElement();
                $objWriter->startElement('meta:user-defined');
                    $objWriter->writeAttribute('meta:name', 'category');
                    $objWriter->writeRaw($pPHPExcel->getProperties()->getCategory());
                $objWriter->endElement();
            $objWriter->endElement();
        $objWriter->endElement();
 
        return $objWriter->getData();
    }
}