Reader.php

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<?php
namespace Magento\Framework\Config;

use Magento\Framework\Exception\LocalizedException;

class Reader implements \Magento\Framework\App\Config\Scope\ReaderInterface
{
    private $sources;

    public function __construct(array $sources)
    {
        $this->sources = $this->prepareSources($sources);
    }

    public function read($scope = null)
    {
        $config = [];
        foreach ($this->sources as $sourceData) {
            $source = $sourceData['class'];
            $config = array_replace_recursive($config, $source->get($scope));
        }

        return $config;
    }

    private function prepareSources(array $array)
    {
        $array = array_filter(
            $array,
            function ($item) {
                return (!isset($item['disable']) || !$item['disable']) && $item['class'];
            }
        );
        uasort(
            $array,
            function ($firstItem, $nexItem) {
                return (int)$firstItem['sortOrder'] <=> (int)$nexItem['sortOrder'];
            }
        );

        return $array;
    }
}