/**
* @return bool
* @param string $s_input
* @param string[] field names $a_keys
* @desc Test whether a short URL is already taken by another page
*/
public function Test($s_input, $a_keys)
{
$this->SetMessage(str_replace('{0}', htmlspecialchars($s_input), $this->GetMessage()));
require_once 'authentication-manager.class.php';
$manager = new AuthenticationManager($this->GetSiteSettings(), $this->GetDataConnection());
$taken = $manager->IsEmailRegistered($s_input);
unset($manager);
return !$taken;
}