Converter.php

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

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    public function convert($source)
    {
        $output = [];
        foreach ($source as $key => $value) {
            $this->_setArrayValue($output, $key, $value);
        }
        return $output;
    }

    protected function _setArrayValue(array &$container, $path, $value)
    {
        $segments = explode('/', $path);
        $currentPointer = & $container;
        foreach ($segments as $segment) {
            if (!isset($currentPointer[$segment])) {
                $currentPointer[$segment] = [];
            }
            $currentPointer = & $currentPointer[$segment];
        }
        $currentPointer = $value;
    }
}