public function saveString()
{
$content = '<?xml version="1.0"?>
<?mso-application progid="Excel.Sheet"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:html="http://www.w3.org/TR/REC-html40">
<DocumentProperties xmlns="urn:schemas-microsoft-com:office:office">';
foreach ($this->doc_prop as $propname => $propval) {
$content .= '
<' . $propname . '>' . $propval . '</' . $propname . '>';
}
$content .= '
</DocumentProperties>
<Worksheet ss:Name="Sheet1">
<Table>' . $this->tabl_data . '
</Table>
</Worksheet>
</Workbook>';
return $content;
}