$url = 'http://www.***.com/testing.php';

$dataToSend = array(
  'id' => 'value',
  'other_id' => 'otherValue'
);

$url += '?'.http_build_query($dataToSend);
// $url is now:
// http://somewhere.com/page.php?key=value&otherKey=otherValue

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$response = curl_exec($ch);

if (!$response) {
 echo curl_error($response);
}