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<?php
/**
 * This file is part of the league/oauth2-client library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Alex Bilbie <hello@alexbilbie.com>
 * @license http://opensource.org/licenses/MIT MIT
 * @link http://thephpleague.com/oauth2-client/ Documentation
 * @link https://packagist.org/packages/league/oauth2-client Packagist
 * @link https://github.com/thephpleague/oauth2-client GitHub
 */

namespace League\OAuth2\Client\Tool;

/**
 * Provides generic array navigation tools.
 */
trait ArrayAccessorTrait
{
    /**
     * Returns a value by key using dot notation.
     *
     * @param  array      $data
     * @param  string     $key
     * @param  mixed|null $default
     * @return mixed
     */
    private function getValueByKey(array $data, $key, $default = null)
    {
        if (!is_string($key) || empty($key) || !count($data)) {
            return $default;
        }

if (strpos($key, '.') !== false) {
            $keys = explode('.', $key);

foreach ($keys as $innerKey) {
                if (!is_array($data) || !array_key_exists($innerKey, $data)) {
                    return $default;
                }

$data = $data[$innerKey];
            }

return $data;
        }

return array_key_exists($key, $data) ? $data[$key] : $default;
    }
}