function http_post_data($url, $data_string) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
Content-Type: application/json; charset=utf-8,
Content-Length: . strlen($data_string))
);
ob_start();
curl_exec($ch);
$return_content = ob_get_contents();
ob_end_clean();
$return_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
return array($return_code, $return_content);
}