$crl = curl_init();

$headr = array();
$headr[] = 'Content-length: 0';
$headr[] = 'Content-type: application/json';
$headr[] = 'Authorization: OAuth '.$accesstoken;

curl_setopt($crl, CURLOPT_HTTPHEADER,$headr);
curl_setopt($crl, CURLOPT_POST,true);
$rest = curl_exec($crl);

curl_close($crl);

print_r($rest);