$id='1227feacf41c472e5ee34e20b510a240ad81ea6e';

echo 'id '.$id."\n";

$url = 'http://example.com/activity/pub?id='.$id;
echo 'url '.$url."\n";

$data = array( 'foo' => 'bar' );
$data_json = json_encode($data);
echo $data_json."\n";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json','Content-Length: ' . strlen($data_json)));
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_POSTFIELDS,$data_json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response  = curl_exec($ch);
curl_close($ch);