Encurtador de URL API bit.ly

<?php
//função do curl
function curl_get_result($url) {
  $ch = curl_init($url);
  $timeout = 50;
  curl_setopt($ch,CURLOPT_URL,$url);
  curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
  curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
  $data = curl_exec($ch);
  curl_close($ch);
  return $data;
}
function shortURL($link) {
	$format = "json"; //formato da URL
	$login = ""; // digite o login do bit.ly
	$apiKey = ""; //insira a key da api (http://bitly.com/a/your_api_key/)

	//pega as informações e passa para a API
	$bitly = 'https://api-ssl.bitly.com/v3/shorten?login='.$login.'&apiKey='.$apiKey.'&longUrl='.urldecode($link).'&format='.$format;

	$getURL = curl_get_result($bitly);

	$json = @json_decode($getURL, true);

	return $json['data']['url'];

}
echo shortURL("http://google.com");
?>