public function scanNextFile() {
		$_file = each($this->files);
		if ($_file === false) {
			return false;
		}
		$file = $_file['value'];

		$lines = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
		if ($lines === false) {
			$lines = [];
		}
		return $lines;
	}