我编写了一个插件来启用用户名中的希伯来文字符。以下是完整代码：

add_filter (\'sanitize_user\', \'hu_sanitize_user\', 10, 3);

//Overrides the Wordpress sanitize_user filter to allow hebrew letters and english letters only

function hu_sanitize_user ($username, $raw_username, $strict)
{
//Strip HTML Tags
$username = wp_strip_all_tags ($raw_username);

//Remove Accents
$username = remove_accents ($username);

//Kill octets
$username = preg_replace (\'|%([a-fA-F0-9][a-fA-F0-9])|\', \'\', $username);


//Kill entities
$username = preg_replace (\'/&.+?;/\', \'\', $username);

if ($strict){
    //Replace
    $username = preg_replace( \'[\\p{Hebrew}a-zA-Z]\', \'\', $username );
}

//Remove Whitespaces
$username = trim ($username);

// Consolidate contiguous Whitespaces
$username = preg_replace (\'|\\s+|\', \' \', $username);

return $username;

它工作得很好，但问题是，如果用户名的长度超过8个字符，它不会在用户列表中创建用户。但是，它仍然会发送一封确认电子邮件，确认用户已创建，邮件中缺少名称和电子邮件地址。

知道我做错了什么吗？