> fflush()的使用是否正确？我在一些例子中看过它,但不是全部.
>我无法让它为有意的坏设备令牌发出错误.为什么？
>此解决方案是否可扩展到数千台设备(假设PHP最大内存增加足够)？
>其他问题？

笔记：
– 通知的设备令牌在开始时存储在数组中.
– 它不是异步的,但它在发送每个通知后检查(过去)错误,并在最后一次通知后再检查一整秒.
– 它使用较新的“现代”通知格式,而不是原始或扩展格式.
– 它将令牌数组的索引作为标识符发送给APNS.
– 它使用checkAppleErrorResponse()函数,该函数读取前6个字节并返回false或失败的标识符(索引),以便它可以备份并继续下一个标记. (失败后发送的所有令牌都将失效.)

$ctx = stream_context_create();
stream_context_set_option($ctx,'ssl','passphrase',$iosCertPassphrase);
stream_context_set_option($ctx,"ssl","local_cert",$iosCertKey);
$fp = NULL;
$errno = NULL;
$errstr = NULL;

// same payload for all
$item2 = chr(2) . pack("n",strlen($payload)) . $payload; // payload item has id 2,a 2-byte length ("n") containing length of payload,then payload

$errorID = -1;

while ($errorID !== false) {
    $fp = stream_socket_client($iosHost . ':' . $iosPort,$errno,$errstr,60,STREAM_CLIENT_CONNECT|STREAM_CLIENT_PERSISTENT,$ctx);        

    if ($fp === FALSE) {
        echo('Failed to create socket');
        break;
    }

    stream_set_blocking($fp,0);

    for ($id = $errorID + 1 ; $id < sizeof($iosTokens); $id++) {
        $errorID = false;
        $item1 = chr(1) . pack('n',32) . pack("H*",$iosTokens[$id]['device_token']); // device token item has 1-byte id 1,2-byte length ("n") containing 32,then 32-byte device token

        $item3 = chr(3) . pack('n',4) . pack('N',$id); // notification identifier has 1-byte id 3,2-byte length ("n") containing 4,then 4-byte identifier

        $frame = $item1 . $item2 . $item3;

        $msg = chr(2) . pack("N",strlen($frame)) . $frame; // for "modern" push notification format,msg has 1-byte id 2,4-byte length ("N") containing the length of the frame,then frame

        fwrite($fp,$msg);

        $errorID = checkAppleErrorResponse($fp);
        fflush($fp);

        if ($errorID !== false) // if there's an error,stop now
            break;
    }

    // if done with for loop and no errors,pause for a sec and check one last time
    if ($errorID === false) {
        $read = array($fp);
        $null = null;
        $changedStreams = stream_select($read,$null,1000000);

        //check if it is actually false
        if ($changedStreams === false) 
            {    
            //close stream when done.
            socket_close($fp);
            fclose($fp);
            }
        elseif ($changedStreams > 0) 
            {
            // set the error and redo starting after errorID index
            $errorID = checkAppleErrorResponse($fp);
            }
        }
    }
}