PathInfo.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\App\Request;

class PathInfo
{
    public function getPathInfo(string $requestUri, string $baseUrl) : string
    {
        if ($requestUri === '/') {
            return '';
        }

        $requestUri = $this->removeRepeatedSlashes($requestUri);
        $parsedRequestUri = explode('?', $requestUri, 2);
        $pathInfo = (string)substr(current($parsedRequestUri), (int)strlen($baseUrl));

        if ($this->isNoRouteUri($baseUrl, $pathInfo)) {
            $pathInfo = \Magento\Framework\App\Router\Base::NO_ROUTE;
        }
        return $pathInfo;
    }

    public function getQueryString(string $requestUri) : string
    {
        $requestUri = $this->removeRepeatedSlashes($requestUri);
        $parsedRequestUri = explode('?', $requestUri, 2);
        $queryString = !isset($parsedRequestUri[1]) ? '' : '?' . $parsedRequestUri[1];
        return $queryString;
    }

    private function removeRepeatedSlashes($pathInfo) : string
    {
        $firstChar = (string)substr($pathInfo, 0, 1);
        if ($firstChar == '/') {
            $pathInfo = '/' . ltrim($pathInfo, '/');
        }

        return $pathInfo;
    }

    private function isNoRouteUri($baseUrl, $pathInfo) : bool
    {
        $firstChar = (string)substr($pathInfo, 0, 1);
        return $baseUrl !== '' && !in_array($firstChar, ['/', '']);
    }
}