PHP - 警告 - 未定义的属性 : stdClass - fix?

Question

我在错误日志中收到此警告，想知道如何在我的代码中更正此问题。

警告: PHP 通知:未定义属性:stdClass::$records in script.php on line 440

一些代码:

// Parse object to get account id's
// The response doesn't have the records attribute sometimes.
$role_arr = getRole($response->records);  // Line 440 

如果记录存在则响应

stdClass Object
(
    [done] => 1
    [queryLocator] =>
    [records] => Array
        (
            [0] => stdClass Object
                (
                    [type] => User
                    [Id] =>
                    [any] => stdClass Object
                        (
                            [type] => My Role
                            [Id] =>
                            [any] => <sf:Name>My Name</sf:Name>
                        )

                )

        )

    [size] => 1
)

记录不存在时的响应

stdClass Object
(
    [done] => 1
    [queryLocator] =>
    [size] => 0
)

我在想类似 array_key_exists() 的功能，但对于对象，什么？还是我做错了？

Answer 1

if(isset($response->records))
    print "we've got records!";