如何在用户名中允许特殊字符？

有什么办法允许用户名中的特殊字符，如“＃”和“〜”？

您必须重写defualt user_validate_name（$ name）：

Verify the syntax of the given name.

为此，请在自定义模块中定义用户名验证代码

function MODULENAME_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'user_register') {      
    $form['#validate'] = array();
    $form['#validate'][] = 'registration_username_validate';

  }
}

在registration_username_validate函数内部，执行您的逻辑以允许使用特殊字符。

注意由允许在用户名中使用特殊字符引起的安全性问题，以及未经过消毒的用户名可能导致的主题显示问题。

不幸的是，没有直接的方法可以做到这一点。默认情况下，user_register_form并user_profile_form已将其user_account_form_validate设置为中的第一个验证器$form['#validate']。user_account_form_validate()检查并清理帐户的名称，电子邮件和签名。作为检查名称的一部分，它会呼叫user_validate_name()。这是我们要覆盖的功能，而不是user_account_form_validate。

人们希望有一个有用的钩子来替代它，但是but。如果我既不关心电子邮件和签名的验证，也不想检查名称是否重复，可以user_account_form_validate从中 删除$form['#validate']。但这不好。取而代之的是，我添加了一个附加的验证器，该验证器撤消了工作user_validate_name()并重做了所有内容而无需特殊字符检查。

<?php
function MODULENAME_form_user_register_form_alter(
  array &$form, array &$form_state, $form_id)
{
  MODULENAME_add_name_validator($form);
}

function MODULENAME_form_user_profile_form_alter(
  array &$form, array &$form_state, $form_id)
{
  MODULENAME_add_name_validator($form);
}

function MODULENAME_add_name_validator(array &$form)
{
  $validate =& $form['#validate'];
  # Since `validate_name()` clears out any errors for the "name" field, we
  # want to put it right after the validator we want to partially override.
  $acct_validate_index = array_search('user_account_form_validate', $validate);
  array_splice($validate, ($acct_validate_index + 1), 0,
    ['MODULENAME_validate_name']
  );
}

function MODULENAME_validate_name(array $form, array &$form_state)
{
  # There is no blessed way of overriding the call to `user_validate_name()` in
  # `user_account_form_validate()`.
  $errors =& drupal_static('form_set_error', []);
    # Yes, this gets the errors. `form_get_error()` uses this method so... yeah.
  if (!isset($errors['name']))
    # `user_validate_name()` is a superset of what is checked here. If the name
    # passed that validation, no need to rerun things.
    return;

  # `form_set_error()` also calls `drupal_set_message()` if it finds an
  # error.
  $msg_index = array_search($errors['name'], $_SESSION['messages']['error']);
  if ($msg_index !== false) {
    unset($_SESSION['messages']['error'][$msg_index]);
    if (empty($_SESSION['messages']['error']))
      unset($_SESSION['messages']['error']);
  }
  unset($errors['name']);

  $name = isset($form_state['values']['name'])
          ? $form_state['values']['name'] : null;

  # These checks are taken from `user_validate_name()`, simply excluding the
  # for characters we don't mind being in the names.
  if (!$name)
    $error = t('You must enter a username.');
  else if (substr($name, 0, 1) == ' ')
    $error = t('The username cannot begin with a space.');
  else if (substr($name, -1) == ' ')
    $error = t('The username cannot end with a space.');
  else if (strpos($name, '  ') !== FALSE)
    $error = t('The username cannot contain multiple spaces in a row.');
  else if (preg_match('/[\x{80}-\x{A0}' .   // Non-printable ISO-8859-1 + NBSP
                      '\x{AD}' .            // Soft-hyphen
                      '\x{2000}-\x{200F}' . // Various space characters
                      '\x{2028}-\x{202F}' . // Bidirectional text overrides
                      '\x{205F}-\x{206F}' . // Various text hinting characters
                      '\x{FEFF}' .          // Byte order mark
                      '\x{FF01}-\x{FF60}' . // Full-width latin
                      '\x{FFF9}-\x{FFFD}' . // Replacement characters
                      '\x{0}-\x{1F}]/u',    // NULL byte and control characters
                      $name))
    $error = t('The username contains an illegal character.');
  else if (drupal_strlen($name) > USERNAME_MAX_LENGTH)
    $error = t('The username %name is too long: it must be %max characters '
              .'or less.'
              ,['%name' => $name, '%max' => USERNAME_MAX_LENGTH]);

  if (isset($error))
    form_set_error('name', $error);
}

仍然存在特殊字符检查，但是它仅检查不可见或特殊用途的字符。