Placeholder.php

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

use Magento\Framework\App\Config\Spi\PostProcessorInterface;
use Magento\Store\Model\Config\Placeholder as ConfigPlaceholder;

class Placeholder implements PostProcessorInterface
{
    private $configPlaceholder;

    public function __construct(ConfigPlaceholder $configPlaceholder)
    {
        $this->configPlaceholder = $configPlaceholder;
    }

    public function process(array $data)
    {
        foreach ($data as $scope => &$scopeData) {
            if ($scope === 'default') {
                $scopeData = $this->configPlaceholder->process($scopeData);
            } else {
                foreach ($scopeData as &$sData) {
                    $sData = $this->configPlaceholder->process($sData);
                }
            }
        }

        return $data;
    }
}