elseif elseif elseif ...

if-else.php

if (!($posteduser) || !($_POST['password']) || !($_POST['email'])) {
  $tplVars['error'] = T_('You <em>must</em> enter a username, password and e-mail address.') ;

// Check if username is reserved
} elseif ($userservice->isReserved($posteduser)) {
  $tplVars['error'] = T_('This username has been reserved, please make another choice.') ;

// Check if username already exists
} elseif ($userservice->getUserByUsername($posteduser)) {
  $tplVars['error'] = T_('This username already exists, please make another choice.') ;
    
// Check if e-mail address is valid
} elseif (!$userservice->isValidEmail($_POST['email'])) {
  $tplVars['error'] = T_('E-mail address is not valid. Please try again.') ;

// Register details
} elseif ($userservice->addUser($posteduser, $_POST['password'], $_POST['email'])) {
  // Log in with new username
  $login = $userservice->login($posteduser, $_POST['password']) ;
  if ($login) {
    header('Location: '. createURL('bookmarks', $posteduser)) ;
  }
  $tplVars['msg'] = T_('You have successfully registered. Enjoy!') ;
} else {
  $tplVars['error'] = T_('Registration failed. Please try again.') ;
}