Create a droplet via php using API 2

Hi guys, I’m trying to create a new droplet using their API, but when I post the request, it returns blank. Here is my code.

<?php
$url = 'https://api.digitalocean.com/v2/droplets';
$data = 'name=TestDroplet&region=ams3&size=512mb&image=449676322';
//url-ify the data for the POST
foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
rtrim($fields_string,'&');

//open connection
$ch = curl_init();

//set the url, number of POST vars, POST data
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_POST,count($fields));
curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);
curl_setopt($ch,CURLOPT_HTTPHEADERS => array(
            'Authorization: Bearer Authorization: Bearer MY KEY',
            'Content-Type: application/json',
            'Content-Length: ' . strlen($data)
        ));
//execute post
$result = curl_exec($ch);
print_r $result;
?>

Thanks.