嘿,我有以下代码下载大文件,但下载确实每次都停止而没有完成下载
function download($file)
{
include('logger.php5');
$log = new Logging();
$log->lfile('download.log');
ini_set('max_execution_time', 86400);
//header('Location: '.$file);
$filesize = filesize($file);
$filename = pathinfo($file, PATHINFO_BASENAME);
$filext = pathinfo($file, PATHINFO_EXTENSION);
$mime = include('mime.php5');
$log->lwrite(ini_get('max_execution_time'));
$log->lwrite(sprintf('%s %s %s %s', $filename, $filext, $mime[$filext], human_filesize($filesize)));
$log->lclose();
@ob_end_clean();
session_write_close();
header("Content-Description: File Transfer");
header("Content-Type: ".$mime[$filext]);
header("Content-Disposition: ".
(!strpos($HTTP_USER_AGENT,"MSIE 5.5")?"attachment; ":"").
"filename=".$filename);
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$filesize);
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public");
header('Pragma: public');
header('Expires: 0');
$done = readfile_chunked($file);
}
function readfile_chunked($filename,$retbytes=true) {
$chunksize = 1*(1024*1024); // how many bytes per chunk
$buffer = '';
$cnt =0;
// $handle = fopen($filename, 'rb');
$handle = fopen($filename, 'rb');
if ($handle === false) {
return false;
}
while (!feof($handle)) {
$buffer = fread($handle, $chunksize);
echo $buffer;
ob_flush();
flush();
if ($retbytes) {
$cnt += strlen($buffer);
}
}
$status = fclose($handle);
if ($retbytes && $status) {
return $cnt; // return num. bytes delivered like readfile() does.
}
return $status;
}
每次调用脚本时,下载启动但在400MB后停止,文件本身大小为778MB。
有人可以看到代码有问题吗?
更新
在尝试记录readfile_chunked
的返回值之后,感觉就像脚本被停止而不是下载本身。因为我无法在readfile_chunked
电话后获得日志条目。
答案 0 :(得分:-1)
PHP中的filesize
函数可能存在问题。有大文件大小读取的已知错误,当您将文件作为标题发送时,我建议您在不使用此行的情况下尝试脚本:
header("Content-Length: ".$filesize);
哦,也许你可以看看这一行:
header("Content-Transfer-Encoding: binary");
我认为应该检查每个文件的编码。像这样:
$finfo = finfo_open(FILEINFO_MIME);
//check to see if the mime-type starts with 'text'
return substr(finfo_file($finfo, $filename), 0, 4) == 'text';
如果是文本文件,则应使用ASCII ofcourse。与问题无关,但我认为这是对你的脚本有用的补充:)