/**
* Export the object as xml text, OR xml file.
*
* If the file extension is svgz, the function will save it correctely;
*
* @param string $filename the file to save, is optional, you can output to a var
* @return string the xml string if filename is not passed
*/
public function asXML($filename = null)
{
//if is svgz use compres.zlib to load the compacted SVG
if (SVGDocument::getFileExtension($filename) == self::EXTENSION_COMPACT) {
//verify if zlib is installed
if (!function_exists('gzopen')) {
throw new Exception('GZip support not installed.');
return false;
}
$filename = 'compress.zlib://' . $filename;
}
$xml = parent::asXML(null);
//need to do it, if pass a null filename it return an error
if ($filename) {
return file_put_contents($filename, $xml);
}
return $xml;
}
