setTimezone($timezone);
            $isVideo = '';
            $body['aps'] = array(
                "content-available" => 1,
                "data" => array(
                    "loc-key" => "Incoming Call from 1234",
                    "call-id" => 'b17efaa8-bb64-4b0a-9055-c72c1ea48b10',
                    "is_video" => $isVideo,
                    "alert" => array(
                        "items" => array(
                            "peer_caller_id_name" => "Demo Test",
                            "peer_caller_id_number" => 1234,
                            "calldate" => $datetime->format('Y-m-d H:i:s')
                        )
                    )
                ),
                "alert" => array(
                    "items" => array(
                        "peer_caller_id_name" => "Demo Test",
                        "peer_caller_id_number" => 1234,
                        "datetime" => date("Y-m-d H:i:s")
                    )
                ),
                "sound" => "default"
            );

            // Encode the payload as JSON
            $message = json_encode($body);
            // open connection
            if (!defined('CURL_HTTP_VERSION_2_0')) {
                define('CURL_HTTP_VERSION_2_0', 3);
            }
            $http2ch = curl_init();
            // curl_setopt($http2ch, CURLOPT_SSL_VERIFYHOST, 0);
            // curl_setopt($http2ch, CURLOPT_SSL_VERIFYPEER, 0);

            curl_setopt($http2ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);

            $headers = array(
                "apns-topic: {$app_bundle_id}",
                "User-Agent: Test",
                "apns-push-type : voip",
                "apns-expiration: 0",
                "apns-priority : 10"
            );

            $status = sendHTTP2Push($http2ch, $http2_server, $apple_cert, $app_bundle_id, $message, $token, $headers);
           echo "Response from apple -> {$status}\n";

            curl_close($http2ch);

            if ($status) {
                return true;
            } else {
                return false;
            }
        }
function sendHTTP2Push($http2ch, $http2_server, $apple_cert, $app_bundle_id, $message, $token, $headers)
    {

        $milliseconds = round(microtime(true) * 1000);
        
        $url = "{$http2_server}/3/device/{$token}";

        // certificate
        $cert = realpath($apple_cert);

        // other curl options
        curl_setopt_array($http2ch, array(
            CURLOPT_URL => "{$url}",
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => $message,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => 30,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSLCERT => $cert,
            CURLOPT_HEADER => 1
        ));

        $result = curl_exec($http2ch);
       var_dump($result);

        // if ($result === false) {
        //     throw new Exception('Curl failed with error: ' . curl_error($http2ch));
        // }
        if ($result === FALSE) {
            // Handle the error gracefully without throwing an exception
            echo 'Curl failed with error: ' . curl_error($http2ch);
            // Close the curl session
            curl_close($http2ch);
            // Return an appropriate status (you might want to define your own error status)
            return 'Curl Error';
        }
    
        $status = curl_getinfo($http2ch, CURLINFO_HTTP_CODE);

        $duration = round(microtime(true) * 1000) - $milliseconds;

        return $status;
    }
?>