总的来说，这是一个大问题

我们有一个

add_filter("wpmu_validate_blog_signup", "my_validate");

从这里开始，你必须绕过这个错误。由于一些版权问题，我无法向您展示我的确切代码，但至少是其中的一部分。在本例中，我们在允许的字符中添加连字符。我还通过google和stack overflow解决了这个问题

function my_validate($result)
{
$errors = $result[\'errors\'];


// we only want to filter if there is an error

if (!is_object($errors))
{
    return $result;
}

// create a new var to hold errors

$newerrors = new WP_Error();


// loop through the errors and look for the one we are concerned with

foreach($errors->errors as $key => $value)
{

    // if the error is with the blog name, check to see which one

    if ($key == \'blogname\')
    {
        foreach($value as $subkey => $subvalue)
        {
            switch ($subvalue)
            {
            case \'Site names can only contain lowercase letters (a-z) and numbers.\':
                $allowedchars = \'-\';

                // so whatever you do, you can add something to the allowedchars and bypass the preg match.
// by the way , the exact error case you need to get from the language file
                $allowed = \'/[a-z0-9\' . $allowedchars . \']+/\';
                preg_match($allowed, $result[\'blogname\'], $maybe);
                if ($result[\'blogname\'] != $maybe[0])
                {

                    // still fails, so add an error to the object

                    $newerrors->add(\'blogname\', __("Only lowercase letters and numbers allowed"));
                }

                continue;