These functions allow you to add and remove classes from page elements.
这些函数允许从页面元素添加和删除类。
Along with custom filters, you can also add custom functions and register global variables.
除了定制过滤器，您还可以添加定制函数和注册全局变量。
Right now, it's time to add the follow_user() and unfollow_user() functions to functions.php.
现在，将 follow_user()和 unfollow_user()函数添加到functions.php 中。
Secondly we perfect existing function and add new functions in the platform.
在此基础上完成对原来已有功能的完善和未实现功能的添加；
Secondly we perfect existing function and add new functions in the platform.
在此基础上完成对原来已有功能的完善和未实现功能的添加；
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