AbstractMapper.php

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

abstract class AbstractMapper implements MapperInterface
{
    protected function _hasValue($key, $target)
    {
        if (false == is_array($target)) {
            return false;
        }

        $paths = explode('/', $key);
        foreach ($paths as $path) {
            if (array_key_exists($path, $target)) {
                $target = $target[$path];
            } else {
                return false;
            }
        }
        return true;
    }
}