Simplest PHP example for retrieving user_timeline with Twitter API version 1.1

Because of the Twitter API 1.0 retirement as of June 11th 2013, the script below does not work anymore.

// Create curl resource 
$ch = curl_init(); 
// Set url 
curl_setopt($ch, CURLOPT_URL, "http://twitter.com/statuses/user_timeline/myscreenname.json?count=10"); 
// Return the transfer as a string 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
// $output contains the output string 
$output = curl_exec($ch); 
// Close curl resource to free up system resources 
curl_close($ch);

if ($output) 
{
    $tweets = json_decode($output,true);

    foreach ($tweets as $tweet)
    {
        print_r($tweet);
    }
}

How can I get the user_timeline (recent statuses) with the least code possible?

I found this: https://dev.twitter.com/docs/api/1.1/get/statuses/user_timeline
but I get the following error:

"{"errors":[{"message":"Could not authenticate you","code":32}]}"

There are a lot of classes out there but after trying several none of them seem to work because of these updates at Twitter, plus some of them are pretty advanced classes with a lot of functionality that I don’t really need.

What is the simplest/shortest way to get the recent user statuses with PHP?