苹果的文档说：
“如果您发送通知，而 APNs 发现通知格式错误或无法理解，它会在断开连接之前返回一个错误响应数据包。（如果没有错误，APNs 不会返回任何内容。）图 5-3 描述了以下格式错误响应数据包。”
这让我相信，APNS 不会发回东西的唯一原因是我发送给他们的东西格式是否正确。但是，当我试图为他们的响应而担心时，我得到一个长度为 0 的字符串，并且当 unpacked 变为 null 时，我认为这意味着没有任何东西被写回给我。
我流被打开stream_socket_client()并且没有返回 false 或抛出异常。我知道我的 fwrite 也成功地向该流写入了 154 个字节。为什么苹果没有回应？
以下是连接到 APNS 的代码：
function openConnection() {
$streamContext = stream_context_create();
stream_context_set_option($streamContext, 'ssl', 'local_cert', $this->APNS_CERT);
stream_context_set_option($streamContext, 'ssl', 'passphrase', $this->Password);
$apns = stream_socket_client('ssl://' . $this -> APNS_HOST . ':' . $this -> APNS_PORT, $error, $errorString, 60, STREAM_CLIENT_CONNECT, $streamContext);
return $apns;
}
然后，在调用 openConnection 之后的下一个方法中：
//open the connection to use with apple.
$apns = $this->openConnection();
$alert = $message['alert'];
$badge = $message['badge'];
$deviceToken = $message['deviceToken'];
$payload['aps'] = array(
'alert' => $message['alert'],
'badge' => $message['badge'],
'sound' => $message['sound']
);
if ($message['extraPayload'] != null) {
$payload['acme'] = $message['extraPayload'];
}
$encodedString = json_encode($payload);
//create message
$apnsMessage = chr(1) . pack("N", $message['identifier']) . pack("N", $message['expire']) . pack("n", 32) . pack('H*', str_replace(' ', '', $message['deviceToken'])) . pack("n",strlen($encodedString)) . $encodedString;
$write = fwrite($apns, $apnsMessage);
echo $write;
//the echo was just to see if it wrote.
if (!$apns) {
socket_close($apns);
fclose($apns);
echo "connection to APNS was lost.";
}
//look for changes. $null=null because some bug doesn't just let you pass null.
$null = null;
$changedStreams = stream_select($streamArray, $null, $null, 0, 1000000);
//check if it is actually false
if ($changedStreams === false) {
//close stream when done.
socket_close($apns);
fclose($apns);
echo "No response from APNs";
} elseif ($changedStreams > 0) {
//then check if what they sent back is an error and grab the error packet
$responseBinary = fread($apns, 6);
var_dump($responseBinary);
//check that it's the right thing
if ($responseBinary != false || strlen($responseBinary) == 6) {
//convert it from it's binary stream state and print.
$response = unpack('Ccommand/Cstatus_code/Nidentifier', $responseBinary);
var_dump($response);
//close stream when done.
socket_close($apns);
fclose($apns);
}
} else {
echo "Apple failed to respond, message was not sent.";
}
最后var_dump是NULL.
编辑：
原来这是一个凭证冲突的错误。它是通过创建一个新的 pem 文件来解决的。