我们在使用wordpress建站的过程当中，有些客户要求后台可以使用中文用户名来进行注册和登录。借鉴wp-includes/formatting.PHP中sanitize_user函数的写法，可以使用下面的方法实现。
切换到模板目录，打开 functions.PHP 文件，添加如下代码：
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