Amp\Artax\Uri::mergePaths PHP Method

    private function mergePaths($basePath, $pathToMerge)
    {
        if ($basePath == '') {
            $merged = '/' . $pathToMerge;
        } else {
            $parts = explode('/', $basePath);
            array_pop($parts);
            $parts[] = $pathToMerge;
            $merged = implode('/', $parts);
        }
        return $this->removeDotSegments($merged);
    }