苹果推送通知系统未接收消息！(PHP）

这是我为发送苹果推送通知而编写的代码。在device_tokens中，我正在发送一个数组，其中包含我要向其发送消息的所有令牌。出于某种原因，我停止接收来自该系统的消息。

以前也用过！

private function send_iphone_notification($device_tokens, $message) 
{
    define("PRODUCTION_MODE", true);
    $apnsPort = 2195;
    // Choose dev or production apns host and certificate
    if(PRODUCTION_MODE) {
        $apnsHost = 'gateway.push.apple.com';
        $apnsCert = $_SERVER['DOCUMENT_ROOT'].'/ant/www/apns/PushIphone.pem';
    } else {
        $apnsHost = 'gateway.sandbox.push.apple.com';
        $apnsCert = $_SERVER['DOCUMENT_ROOT'].'/ant/www/apns/CertificatesDev.pem';
    }
    // Notification content
    $payload = json_encode(array('notification_from_panel' => 1, 'aps' => array('alert' => $message, 'badge' => 1, 'sound' => 'default')));
    $streamContext = stream_context_create();
    stream_context_set_option($streamContext, 'ssl', 'local_cert', $apnsCert);
    stream_context_set_option($streamContext, 'ssl', 'passphrase', "");
    // loop all devices tokens
    foreach ($device_tokens as $device_token) 
    {                       
        try {
            $apns = stream_socket_client('ssl://' . $apnsHost . ':' . $apnsPort, $error, $errorString, 2, STREAM_CLIENT_CONNECT, $streamContext);
        } catch(Exception $e) {
            echo $e->getMessage();
            continue;
        }
        $deviceToken = str_replace(" ","",substr($device_token,1,-1));
        //echo $deviceToken;
        $apnsMessage = chr(0) . chr(0) . chr(32) . pack('H*', str_replace(' ', '', $deviceToken)) . chr(0) . chr(mb_strlen($payload)) . $payload;
        fwrite($apns, $apnsMessage);
        //socket_close($apns);
        fclose($apns);
    }
}