function user_validate_name

Verify the syntax of the given name.

File

modules/user/user.module, line 367

Enables the user registration and login system.

Code

function user_validate_name($name) {
  if (!$name) {
    return t('You must enter a username.');
  }
  if (substr($name, 0, 1) == ' ') {
    return t('The username cannot begin with a space.');
  }
  if (substr($name, -1) == ' ') {
    return t('The username cannot end with a space.');
  }
  if (strpos($name, '  ') !== FALSE) {
    return t('The username cannot contain multiple spaces in a row.');
  }
  if (preg_match('/[^\x{80}-\x{F7} a-z0-9@+_.\'-]/i', $name)) {
    return t('The username contains an illegal character.');
  }
  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
  $name)) {
    return t('The username contains an illegal character.');
  }
  if (backdrop_strlen($name) > USERNAME_MAX_LENGTH) {
    return t('The username %name is too long: it must be %max characters or less.', array('%name' => $name, '%max' => USERNAME_MAX_LENGTH));
  }
}