FileReader.php

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<?php
namespace Magento\Framework\App\DeploymentConfig;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Config\File\ConfigFilePool;
use Magento\Framework\Exception\FileSystemException;
use Magento\Framework\Filesystem\DriverPool;

class FileReader
{
    private $dirList;

    private $configFilePool;

    private $driverPool;

    public function __construct(
        DirectoryList $dirList,
        DriverPool $driverPool,
        ConfigFilePool $configFilePool
    ) {
        $this->dirList = $dirList;
        $this->configFilePool = $configFilePool;
        $this->driverPool = $driverPool;
    }

    public function load($fileKey)
    {
        $path = $this->dirList->getPath(DirectoryList::CONFIG);
        $fileDriver = $this->driverPool->getDriver(DriverPool::FILE);
        $filePath = $path . '/' . $this->configFilePool->getPath($fileKey);

        if ($fileDriver->isExists($filePath)) {
            return include $filePath;
        }

        return [];
    }
}