您可以很容易地做到这一点，只需创建一个用户注册页面，并让电子邮件地址字段填写用户名和电子邮件参数，以用于wp\\u insert\\u user（）函数。

WordPress在创建用户时使用以下功能：

sanitize\\u用户（）

Sanitize username stripping out unsafe characters.

If $strict is true, only alphanumeric characters plus these: _, space, ., -, *, and @ are returned.

Removes tags, octets, entities, and if strict is enabled, will remove all non-ASCII characters. After sanitizing, it passes the username, raw username (the username in the parameter), and the strict parameter as parameters for the filter.

资料来源：http://codex.wordpress.org/Function_Reference/sanitize_user