function generateNewUserId()
{
$commons = new Commons();
$randomString = $commons->generateRandomString(10);
$query = "\n\t\t\tSELECT * FROM " . TAB_USERS . " \n\t\t\tWHERE \t" . COL_USER_ID . " = '{$randomString}' ";
$result = $this->mysqli->query($query);
if (!$this->mysqli->connect_errno) {
if ($result->num_rows == 1) {
return $this->generateNewUserId();
} else {
return $randomString;
}
}
return false;
}