Amp\Artax\Uri::removeDotSegments PHP Method

    private function removeDotSegments($input)
    {
        $output = '';
        $patternA = ',^(\\.\\.?/),';
        $patternB1 = ',^(/\\./),';
        $patternB2 = ',^(/\\.)$,';
        $patternC = ',^(/\\.\\./|/\\.\\.),';
        // $patternD  = ',^(\.\.?)$,';
        $patternE = ',(/*[^/]*),';
        while ($input !== '') {
            if (preg_match($patternA, $input)) {
                $input = preg_replace($patternA, '', $input);
            } elseif (preg_match($patternB1, $input, $match) || preg_match($patternB2, $input, $match)) {
                $input = preg_replace(",^" . $match[1] . ",", '/', $input);
            } elseif (preg_match($patternC, $input, $match)) {
                $input = preg_replace(',^' . preg_quote($match[1], ',') . ',', '/', $input);
                $output = preg_replace(',/([^/]+)$,', '', $output);
            } elseif ($input == '.' || $input == '..') {
                // pattern D
                $input = '';
            } elseif (preg_match($patternE, $input, $match)) {
                $initialSegment = $match[1];
                $input = preg_replace(',^' . preg_quote($initialSegment, ',') . ',', '', $input, 1);
                $output .= $initialSegment;
            }
        }
        return $output;
    }