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我有文件下載PHP腳本。該腳本可以下載最大4GB +的大文件。實際上,用戶將經常會取消下載過程或在下載時關閉瀏覽器窗口。PHP Connection_Aborted()僅適用於有時
因此,我必須在已經開始的下載過程因任何原因而中止時註冊。對此的最佳解決方案看起來是通過connection_aborted()函數監視連接。
'connection_aborted()'似乎對下載取消或關閉我的瀏覽器窗口有反應。我的問題是,它不會以100%的精度做出反應。它註冊了約50%的取消下載或關閉的瀏覽器。如果未檢測到連接中止,則只需在服務器上繼續下載,就好像瀏覽器不會取消它一樣。
請問我的代碼是否存在漏洞和錯誤?我需要了解,是什麼原因導致的行爲:
// 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);
我使用以下命令:
- 的Apache 2.4.4
- PHP 5.4.12
- 的MySQL 5.6.12
- Google Chrome版本32.0.1700.107 m
- Windows 7 x64
謝謝。
Xiongji您好,感謝您的答覆。我測試了修改過的if((connection_status()!= 0)||(connection_aborted()!= 0))',但不幸的是沒有改變。錯誤日誌也沒有顯示任何錯誤。 –