Loader.php

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<?php
namespace Magento\Config\Model\Config;

class Loader
{
    protected $_configValueFactory;

    public function __construct(\Magento\Framework\App\Config\ValueFactory $configValueFactory)
    {
        $this->_configValueFactory = $configValueFactory;
    }

    public function getConfigByPath($path, $scope, $scopeId, $full = true)
    {
        $configDataCollection = $this->_configValueFactory->create();
        $configDataCollection = $configDataCollection->getCollection()->addScopeFilter($scope, $scopeId, $path);

        $config = [];
        $configDataCollection->load();
        foreach ($configDataCollection->getItems() as $data) {
            if ($full) {
                $config[$data->getPath()] = [
                    'path' => $data->getPath(),
                    'value' => $data->getValue(),
                    'config_id' => $data->getConfigId(),
                ];
            } else {
                $config[$data->getPath()] = $data->getValue();
            }
        }
        return $config;
    }
}