【转】WordPress 限制可以注册的邮箱类型

使用方法：复制下面的代码粘贴到网站主题函数functions.php里面。

/*
* Email White List
*/
function is_valid_email_domain($login, $email, $errors){
$valid_email_domains = array("gmail.com", "live.com", "outlook.com", "live.cn", "vip.qq.com", "qq.com", "163.com", "126.com"); // Allowed Email
$valid = false;
foreach($valid_email_domains as $d){
$d_length = strlen($d);
$current_email_domain = strtolower(substr($email, -($d_length), $d_length));
if($current_email_domain == strtolower($d)){
        $valid = true;
        break;
    }
}
// if invalid, return error message
if($valid === false){
        $errors->add('domain_whitelist_error', __('<strong>ERROR</strong>: This Email address is not supported!'));
    }
}
add_action('register_post', 'is_valid_email_domain', 10,3);

来源：https://blog.naibabiji.com/skill/mail-registration-restrictions.html