1:  2:  3:  4:  5:  6:  7:  8:  9: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: 24: 25: 26: 27: 28: 29: 30: 31: 32: 33: 34: 35: 36: 37: 38: 39: 40: 41: 42: 43: 44: 45: 46: 47: 48: 49: 50: 51: 52: 53: 

<?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;
    }
}