function json_post($url, $data = NULL)

    {

        $curl = curl_init();

        curl_setopt($curl, CURLOPT_URL, $url);

        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);

        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);

        if(!$data){

            return 'data is null';

        }

        if(is_array($data))

        {

            $data = json_encode($data);

        }

        curl_setopt($curl, CURLOPT_POST, 1);

        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);

        curl_setopt($curl, CURLOPT_HEADER, 0);

        curl_setopt($curl, CURLOPT_HTTPHEADER,array(

                'Content-Type: application/json; charset=utf-8',

                'Content-Length:' . strlen($data),

                'Cache-Control: no-cache',

                'Pragma: no-cache'

        ));

        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

        $res = curl_exec($curl);

        $errorno = curl_errno($curl);

        if ($errorno) {

            return $errorno;

        }

        curl_close($curl);

        return $res;

    }

$data = json_decode(file_get_contents('php://input'), true);