iPhone推送通知 - 错误响应的问题

发送推送通知后的响应错误检查时，我有一个问题。这是我的设置：

I've got a problem when checking for a response error after sending a Push Notification. This is my setup:

从我的PHP服务器，我送推送通知。这些通知在增强格式发送，这样我可以从苹果服务器的错误响应。例如：错误＃7无效的有效载荷大小

From my PHP server, I'm sending Push Notifications. These notifications are send in the enhanced format, so I can get an error response from the Apple server. For example: Error #7 "Invalid payload size".

我检查错误的方式读取插槽响应：

The way I check for errors is reading the socket response:

const ERROR_RESPONSE_SIZE = 6;
$errorResponse = @fread($this->_apnsSocket, self::ERROR_RESPONSE_SIZE);

这正常工作时，有一个实际的错误。我的问题是：当没有错误，FREAD调用不返回任何东西，会持续永远

This works fine when there is an actual error. By my problem is: when there's no error, the "fread" call doesn't return anything and keeps loading forever.

谁能帮助我？感谢您的帮助！

Can anyone help me with this? Thanks for your help!