yii\authclient\BaseClient::normalizeUserAttributes PHP Method

    protected function normalizeUserAttributes($attributes)
    {
        foreach ($this->getNormalizeUserAttributeMap() as $normalizedName => $actualName) {
            if (is_scalar($actualName)) {
                if (array_key_exists($actualName, $attributes)) {
                    $attributes[$normalizedName] = $attributes[$actualName];
                }
            } else {
                if (is_callable($actualName)) {
                    $attributes[$normalizedName] = call_user_func($actualName, $attributes);
                } elseif (is_array($actualName)) {
                    $haystack = $attributes;
                    $searchKeys = $actualName;
                    $isFound = true;
                    while (($key = array_shift($searchKeys)) !== null) {
                        if (is_array($haystack) && array_key_exists($key, $haystack)) {
                            $haystack = $haystack[$key];
                        } else {
                            $isFound = false;
                            break;
                        }
                    }
                    if ($isFound) {
                        $attributes[$normalizedName] = $haystack;
                    }
                } else {
                    throw new InvalidConfigException('Invalid actual name "' . gettype($actualName) . '" specified at "' . get_class($this) . '::normalizeUserAttributeMap"');
                }
            }
        }
        return $attributes;
    }