bit.ly.php

<?php
class Bitly {
	private $login;
	private $appkey;
	function __construct($login, $appkey) 
	{
		$this->login = $login;
		$this->appkey = $appkey;
	}
	function shorten($url) 
	{
		return $this->curl_get_result("http://api.bit.ly/v3/shorten?login={$this->login}&apiKey={$this->appkey}&uri=".urlencode($url)."&format=txt");
	}
	function expand($url) 
	{
		return $this->curl_get_result("http://api.bit.ly/v3/expand?login={$this->login}&apiKey={$this->appkey}&shortUrl=".urlencode($url)."&format=txt");
	}
	private function curl_get_result($url) 
	{
		$ch = curl_init();
		$timeout = 5;
		curl_setopt($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;
	}
}

$bitly_api = new Bitly("login", "api_key");

$bitly_api->shorten('url');
?>