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我是php和google api的新手,当用户在使用Google+时,我正在尝试获取电子邮件地址,我使用$ plus-> people-> get("me")获取所有用户信息,但是我尝试通过此错误获取失败的电子邮件地址:

PHP注意:未定义的索引:值

这是我的代码:

<?php
session_start();

set_include_path(get_include_path() . PATH_SEPARATOR . $_SERVER['DOCUMENT_ROOT'] . "/src");

require_once 'Google/Client.php';

require_once 'Google/Service/Plus.php';

$client_id = 'XXXXXXXXXXXXXXXXXXXX.apps.googleusercontent.com';
$client_secret = 'XXXXXXXXXXXXXXXXXXX';
$redirect_uri = 'http://www.XXXXXXXXXXXXXX.com/pruebas.php';

$client = new Google_Client();
$client->setClientId($client_id);
$client->setClientSecret($client_secret);
$client->setRedirectUri($redirect_uri);
$client->addScope("https://www.googleapis.com/auth/userinfo.profile");
$client->addScope("https://www.googleapis.com/auth/userinfo.email");

$plus = new Google_Service_Plus($client);

if (isset($_REQUEST['logout'])) {
    unset($_SESSION['access_token']);
}

if (isset($_GET['code'])) {
    $client->authenticate($_GET['code']);
    $_SESSION['access_token'] = $client->getAccessToken();
    $redirect = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
    header('Location: ' . filter_var($redirect, FILTER_SANITIZE_URL));

}

if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
    $client->setAccessToken($_SESSION['access_token']);
    $_SESSION['token'] = $client->getAccessToken();

} else {
    $authUrl …