DocRootLocator.php

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<?php
namespace Magento\Framework\App;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Filesystem\Directory\ReadFactory;

class DocRootLocator
{
    private $request;

    private $readFactory;

    public function __construct(RequestInterface $request, ReadFactory $readFactory)
    {
        $this->request = $request;
        $this->readFactory = $readFactory;
    }

    public function isPub()
    {
        $rootBasePath = $this->request->getServer('DOCUMENT_ROOT');
        $readDirectory = $this->readFactory->create(DirectoryList::ROOT);
        return (substr($rootBasePath, -strlen('/pub')) === '/pub') && !$readDirectory->isExist($rootBasePath . 'setup');
    }
}