Environment.php

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

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\DeploymentConfig;

class Environment implements PlaceholderInterface
{
    const PREFIX = 'CONFIG__';

    private $deploymentConfig;

    public function __construct(DeploymentConfig $deploymentConfig)
    {
        $this->deploymentConfig = $deploymentConfig;
    }

    public function generate($path, $scopeType = ScopeConfigInterface::SCOPE_TYPE_DEFAULT, $scopeCode = null)
    {
        $parts = $scopeType ? [$scopeType] : [];

        if ($scopeType !== ScopeConfigInterface::SCOPE_TYPE_DEFAULT && $scopeCode) {
            $parts[] = $scopeCode;
        }

        $parts[] = $path;

        $template = implode('__', $parts);
        $template = str_replace('/', '__', $template);
        $template = static::PREFIX . $template;
        $template = strtoupper($template);

        return $template;
    }

    public function restore($template)
    {
        $template = preg_replace('/^' . static::PREFIX . '/', '', $template);
        $template = str_replace('__', '/', $template);
        $template = strtolower($template);

        return $template;
    }

    public function isApplicable($placeholder)
    {
        return 1 === preg_match('/^' . static::PREFIX . '([a-zA-Z]+)([a-zA-Z0-9_])*$/', $placeholder);
    }
}