$ext = FileBackend::extensionFromPath( $this->mVirtualTempPath );
// Get a 0-byte temp file to perform the concatenation at
$tmpFile = MediaWikiServices::getInstance()->getTempFSFileFactory()
$ext = FileBackend::extensionFromPath( $this->mVirtualTempPath );
// Get a 0-byte temp file to perform the concatenation at
$tmpFile = MediaWikiServices::getInstance()->getTempFSFileFactory()