ConfigSourceAggregated.php

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

class ConfigSourceAggregated implements ConfigSourceInterface
{
    private $sources;

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

    public function get($path = '')
    {
        $this->sortSources();
        $data = [];
        foreach ($this->sources as $sourceConfig) {
            $source = $sourceConfig['source'];
            $configData = $source->get($path);
            if (!is_array($configData)) {
                $data = $configData;
            } elseif (!empty($configData)) {
                $data = array_replace_recursive(is_array($data) ? $data : [], $configData);
            }
        }
        return $data;
    }

    private function sortSources()
    {
        uasort($this->sources, function ($firstItem, $secondItem) {
            return $firstItem['sortOrder'] > $secondItem['sortOrder'];
        });
    }
}