Curl ile Twitpic sitesine resim upload etmek

$file = $_FILES['media']; 

if (!in_array($file['type'], array('image/png','image/jpeg','image/gif'))) { [/B] [B]
echo '<span style="color:#CC0000;">Not a valid file type, please upload PNG, JPEG or GIF images only.</span>'; 
exit; 
} 

$postfields = array(); [/B] [B]
$postfields['username'] = $username; 
$postfields['password'] = $password; 
$postfields['media'] = "@$file['tmp_name']";

$twitter_url = 'http://twitpic.com/api/upload'; [/B] [B]
$curl = curl_init(); 
curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 2); 
curl_setopt($curl, CURLOPT_HEADER, false); 
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); 
curl_setopt($curl, CURLOPT_BINARYTRANSFER, 1); 
curl_setopt($curl, CURLOPT_URL, $twitter_url); 
curl_setopt($curl, CURLOPT_POST, 3); 
curl_setopt($curl, CURLOPT_POSTFIELDS, $postfields); 
$result = curl_exec($curl); 
curl_close($curl); 
$login_xml = new SimpleXMLElement($result); 
if (isset($login_xml->error)) { 
print_r($login_xml); 
} else { 
print_r($login_xml); 
}