Smarty plugin to shorten url with bit.ly

function.shorten_url.php

function smarty_function_shorten_url($params, &$smarty)
{
//arguments
  if(isset($params['url']) === false)
    return null;
  $url = $params['url'];
//default domain: bit.ly
//can use j.mp if you specify　type
  $type = (isset($params['type']) === false || $params['type'] != 'jmp') ?
    'bitly' :
    'jmp';
//requires
  require_once 'Services/Bitly.php';
//settings
  $login  = LOGIN_NAME;  //login name
  $apikey = API_KEY; //API Key
//try
  try {
    $b = new Services_Bitly($login, $apikey);
  //j.mp
    if($type == 'jmp')
      $b->changeBaseDomain();
    return $b->shorten($url);
  } catch (Services_Bitly_Exception $e) {
    return null;
  }
}