How to define a link to an authorized login (get nickname) in Phpwechat

How do I define a hyperlink to an authorized login (get nickname) in Phpwechat? Make it appear after clicking the following effect?

Because of the integration of this function, in fact, this need is very simple. If you want to jump to http://www.baidu.com/after authorization, the address of this link is:

1 http://devtest.phpwechat.com/index.php?m=wechat&a=auth20&redirect_url= Urlsafe_b64decode (' http://www.baidu.com ')

After authorizing login, the system automatically generates $_session[' OpenID ', which represents the user's OpenID. The user's nickname, Avatar and other information will be automatically stored in the Pw_wechat_fans table.

Note : If you have authorized login or follow the public number, the system will automatically skip this interface.

How to define a link to an authorized login (get nickname) in Phpwechat