connection_aborted()

(PHP 4, PHP 5, PHP 7)

检查客户端是否已经断开

说明

检查客户端是否已经断开。

返回值

如果客户端已经断开则返回1，否则返回0。

参见

• connection_status() 返回连接的状态位
• ignore_user_abort() 设置客户端断开连接时是否中断脚本的执行
• 查看连接处理了解PHP处理连接的详情。

A trick to detecting if a connection is closed without having to send data that will otherwise corrupt the stream of data (like a binary file) you can use a combination of chunking the data on HTTP/1.1 by sending a "0" ("zero") as a leading chunk size without anything else.
*NOTE* it's important to note that it's not a good idea to check the stream more then once every few seconds. By doing this you are potentially increasing the data sent to the user with no gain to the user.
A good reason to do it this way is if you are generating a report that takes a long time to run and takes a lot of server resources. This would allow the server to detect if a user canceled the download and do any cleanup without corrupting the file file being download.
Here is an example: 

(connection_aborted not working)
I had this problem years ago, now the problem came back after upgrading php... i tried everything i found and in the end the function ob_end_flush(); on top of script as post in php bug track solved the problem. Im using windows 7 x64 / php 5.2.4 / apache 2.2.14 (win32)
try adding ob_end_flush(); on top of you script. 
i read something about this but can't remember where, it was related to a bug or something. 
hope this help.

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