SettingChecker.php

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<?php
namespace Magento\Config\Model\Config\Reader\Source\Deployed;

use Magento\Config\Model\Config\Reader;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\DeploymentConfig;
use Magento\Config\Model\Placeholder\PlaceholderInterface;
use Magento\Config\Model\Placeholder\PlaceholderFactory;
use Magento\Framework\App\Config\ScopeCodeResolver;

class SettingChecker
{
    private $config;

    private $placeholder;

    private $scopeCodeResolver;

    public function __construct(
        DeploymentConfig $config,
        PlaceholderFactory $placeholderFactory,
        ScopeCodeResolver $scopeCodeResolver
    ) {
        $this->config = $config;
        $this->scopeCodeResolver = $scopeCodeResolver;
        $this->placeholder = $placeholderFactory->create(PlaceholderFactory::TYPE_ENVIRONMENT);
    }

    public function isReadOnly($path, $scope, $scopeCode = null)
    {
        $config = $this->getEnvValue(
            $this->placeholder->generate($path, $scope, $scopeCode)
        );

        if (null === $config) {
            $config = $this->config->get($this->resolvePath($scope, $scopeCode) . "/" . $path);
        }

        return $config !== null;
    }

    public function getPlaceholderValue($path, $scope, $scopeCode = null)
    {
        return $this->getEnvValue($this->placeholder->generate($path, $scope, $scopeCode));
    }

    public function getEnvValue($placeholder)
    {
        if ($this->placeholder->isApplicable($placeholder) && isset($_ENV[$placeholder])) {
            return $_ENV[$placeholder];
        }

        return null;
    }

    private function resolvePath($scope, $scopeCode)
    {
        $scopePath = 'system/' . $scope;

        if ($scope != ScopeConfigInterface::SCOPE_TYPE_DEFAULT) {
            $scopePath .= '/' . $this->scopeCodeResolver->resolve($scope, $scopeCode);
        }

        return $scopePath;
    }
}