RelsVBA.php

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<?php
class PHPExcel_Writer_Excel2007_RelsVBA extends PHPExcel_Writer_Excel2007_WriterPart
{
        public function writeVBARelationships(PHPExcel $pPHPExcel = null){
                // Create XML writer
                $objWriter = null;
                if ($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','yes');

                // Relationships
                $objWriter->startElement('Relationships');
                $objWriter->writeAttribute('xmlns', 'http://schemas.openxmlformats.org/package/2006/relationships');
                $objWriter->startElement('Relationship');
                $objWriter->writeAttribute('Id', 'rId1');
                $objWriter->writeAttribute('Type', 'http://schemas.microsoft.com/office/2006/relationships/vbaProjectSignature');
                $objWriter->writeAttribute('Target', 'vbaProjectSignature.bin');
                $objWriter->endElement();//Relationship
                $objWriter->endElement();//Relationships

                // Return
                return $objWriter->getData();

        }

}