getArrayDiffParted example

$from = $this->splitStringByLines($from);
        } elseif (!is_array($from)) {
            throw new InvalidArgumentException('"from" must be an array or string.');
        }

        if (is_string($to)) {
            $to = $this->splitStringByLines($to);
        } elseif (!is_array($to)) {
            throw new InvalidArgumentException('"to" must be an array or string.');
        }

        [$from, $to, $start, $end] = self::getArrayDiffParted($from, $to);

        if ($lcs === null) {
            $lcs = $this->selectLcsImplementation($from, $to);
        }

        $common = $lcs->calculate(array_values($from), array_values($to));
        $diff   = [];

        foreach ($start as $token) {
            $diff[] = [$token, self::OLD];
        }