| protected determineFormatVersion ( XMLReader $xmlReader ) : null | string | ||
| $xmlReader | XMLReader | |
| return | null | string | the version as a string or null if the version could not be determined |
protected function determineFormatVersion(\XMLReader $xmlReader)
{
while ($xmlReader->nodeType !== \XMLReader::ELEMENT || $xmlReader->name !== 'nodes') {
if (!$xmlReader->read()) {
break;
}
}
if ($xmlReader->name === 'nodes' && $xmlReader->nodeType === \XMLReader::ELEMENT) {
return $xmlReader->getAttribute('formatVersion');
}
return false;
}