PHP Connection_Aborted（）只有时 [英] PHP Connection_Aborted() Works Only Sometimes

问题描述

我有文件下载PHP脚本。该脚本可以下载大文件最大为4GB +。在现实中，它会经常发生，用户将取消下载进程或将关闭浏览器窗口，同时下载。

I have file download PHP script. The script can download large files up to 4GB+. In reality, it will often happen that users will cancel download process or will close browser window while downloading.

我必须这样做，因此，注册的时候已经开始下载过程将一直为中止任何原因。造成这种情况的最佳解决方案看起来是通过监测 connection_aborted）功能。

I have to, therefore, register when the already started download process will have been for any reason aborted. The optimal solution for this looks to be monitoring connection via connection_aborted() function.

connection_aborted（）似乎在下载反应取消或关闭我的浏览器窗口。我的问题是，它不与100％precision反应。它注册取消下载或封闭的浏览器的约50％。如果没有检测到连接中止，下载简单地在服务器上继续，如果浏览器将不取消它。

'connection_aborted()' seems to react on download cancel or closing my browser window. My problem is, that it does not react with 100% precision. It registers about 50% of cancelled downloads or closed browsers. If the connection abort is not detected, the download simply continues on the server as if the browser would not cancel it.

你，请查看我的code的漏洞和错误？我需要了解，是什么原因导致的行为：

Would you, please, review my code for vulnerabilities and errors? I need to understand, what causes the behavior:

// empty and turn off output buffering
    ob_flush();
    flush();


    // never expire this download script
    set_time_limit(0);

    fseek($fileObject, $seek_start);

    while(!feof($fileObject))
    {
        //usleep(100000);

        //print(@fread($fileObject, $chunkSize));
        echo(@fread($fileObject, $chunkSize));

        // gradually output buffer to avoid memory problems by downloading large files
        ob_flush();
        flush();

        // check if the client was disconnected
        // important for cancelled or interrupted downloads
        if (Connection_Aborted())
        {
            ChromePhp::log("Connection Aborted");

            // sent to the database that the connection has been aborted
            $result = mysqli_query($dbc, "UPDATE current_downloads SET connection_aborted=TRUE WHERE user_id=1;");

            // close the database connection
            mysqli_close($dbc);

            // close the open file
            @fclose($fileObject);

            exit(json_encode(array("result" => false, "error" => "Connection with the client was aborted.")));
        }

        $nLoopCounter++;
        $transferred += $chunkSize;
        $downloadPercentage = (($nLoopCounter * $chunkSize) / $fileSize) * 100;

        $result = mysqli_query($dbc, "UPDATE current_downloads SET progress_percent=$downloadPercentage, transferred=$transferred, connection_aborted=$strConnectionAborted, iteration=$nLoopCounter WHERE user_id=1;");
        if($result == false)
        {
            // close the database connection
            mysqli_close($dbc);

            // close the file
            fclose($handle);

            // prepare output message
            $outputArray = array("result" => 0, "message" => "Error Processing Database Query");

            // output the message
            echo json_encode($outputArray);
            exit;
        }
    }

    // file save was a success
    @fclose($fileObject);

的我用的是以下内容：的

• 的Apache 2.4.4


• PHP 5.4.12


• 的MySQL 5.6.12


• 谷歌Chrome版本32.0.1700.107米


• Windows 7的64

感谢您。

推荐答案

添加功能 CONNECTION_STATUS ，然后再试

if(connection_status()!=0||connection_aborted()!=0||){
    //your code
}

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