Question

我有文件下载PHP脚本。该脚本可以下载最大4GB +的大文件。实际上，用户通常会在下载时取消下载过程或关闭浏览器窗口。

因此，我必须在已经启动的下载过程因任何原因中止时进行注册。对此的最佳解决方案是通过connection_aborted()函数监视连接。

'connection_aborted（）'似乎对下载取消或关闭浏览器窗口做出反应。我的问题是，它没有100％精度的反应。它注册了约50％的已取消下载或已关闭的浏览器。如果未检测到连接中止，则只需在服务器上继续下载，就好像浏览器不会取消它一样。

请您查看我的代码是否存在漏洞和错误？我需要了解导致这种行为的原因：

// 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);

我使用以下内容：

Apache 2.4.4
PHP 5.4.12
MySQL 5.6.12
Google Chrome版本32.0.1700.107 m
Windows 7 x64

谢谢。

Answer 1

添加功能connection_status，然后重试

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

PHP Connection_Aborted（）仅在有时工作

1 个答案: