Browscap\Generator\DiffGenerator::recursiveArrayDiff PHP Method

    private function recursiveArrayDiff(array $leftArray, array $rightArray)
    {
        $diffs = [];
        foreach ($leftArray as $key => $value) {
            if (array_key_exists($key, $rightArray)) {
                if (is_array($value)) {
                    $childDiffs = $this->recursiveArrayDiff($value, $rightArray[$key]);
                    if (count($childDiffs)) {
                        $diffs[$key] = $childDiffs;
                    }
                } else {
                    if ($value !== $rightArray[$key]) {
                        $diffs[$key] = $value;
                    }
                }
            } else {
                $diffs[$key] = $value;
            }
        }
        return $diffs;
    }