我如何user_nicename从这个对象中获取?
BP_User Object
(
[data] => stdClass Object
(
[ID] => 1
[user_login] => NICENICE
[user_pass] => $P$BwLHvV7zxcZZ/zW7MY0NXNSmANP.U5.
[user_nicename] => NICENAME
...
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我在哪里可以找到资源来学习这个?