blocks|key|2114314|text|对于下载文件，我能想到的最简单的方法是把文件放在一个临时位置，并给他们一个唯一的URL，他们可以通过常规的HTTP下载。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2114315|作为生成这些链接的一部分，您还可以删除超过X小时的文件。|2114316|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

For downloading files the easiest way I can think of would be to put the file in a temporary location and give them a unique URL that they can download via regular HTTP.

As part generating these links you could also remove files that were more than X hours old.

blocks|key|2114363|text|当我在过去这样做的时候，我使用了这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2114364|set_time_limit(0);+//Set+the+execution+time+to+infinite.
header('Content-Type:+application/exe');+//This+was+for+a+LARGE+exe+(680MB)+so+the+content+type+was+application/exe
readfile($fileName);+//readfile+will+stream+the+file.|code-block|syntax|javascript|2114365|这3行代码将完成下载的所有工作，readfile()将流式传输指定给客户端的整个文件，并确保设置无限时间限制，否则您可能会在文件完成流式传输之前耗尽时间。|offset|length|2114366|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/readfile^0|0|0|G|A|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

When I have done this in the past I've used this:

<pre><code>set_time_limit(0); //Set the execution time to infinite.
header('Content-Type: application/exe'); //This was for a LARGE exe (680MB) so the content type was application/exe
readfile($fileName); //readfile will stream the file.
</code></pre>

These 3 lines of code will do all the work of the download <a href="http://php.net/readfile" rel="nofollow noreferrer">readfile()</a> will stream the entire file specified to the client, and be sure to set an infinite time limit else you may be running out of time before the file is finished streaming.

blocks|key|2114381|text|如果您正在发送非常大的文件，并且担心这会产生影响，那么您可以使用x-sendfile头文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2114382|来自SOQ+using-xsendfile-with-apache-php的howto+blog.adaniels.nl+:+how-i-php-x-sendfile/|offset|length|2114383|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/80186/using-xsendfile-with-apache-php|1|https://web.archive.org/web/20171205120512/http://blog.jasny.net/articles/how-i-php-x-sendfile/^0|0|6|V|0|18|14|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]|$D|U|E|V|1|W]]|A|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]|N|$5|I|J|K|A|$L|O]]]]

If you are sending truly large files and worried about the impact this will have, you could use the x-sendfile header.
From the SOQ <a href="https://stackoverflow.com/questions/80186/using-xsendfile-with-apache-php">using-xsendfile-with-apache-php</a>, an howto <a href="https://web.archive.org/web/20171205120512/http://blog.jasny.net/articles/how-i-php-x-sendfile/" rel="nofollow noreferrer">blog.adaniels.nl : how-i-php-x-sendfile/</a>

blocks|key|1674733|text|如果你使用lighttpd作为are服务器，安全下载的另一种选择是使用ModSecDownload。它需要服务器配置，但您将让let服务器自己处理下载，而不是PHP脚本。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1674734|生成下载URL看起来像这样(取自文档)，当然它只能为授权用户生成：|1674735|<?php

++$secret+=+"verysecret";
++$uri_prefix+=+"/dl/";

++#+filename
++#+please+note+file+name+starts+with+"/"+
++$f+=+"/secret-file.txt";

++#+current+timestamp
++$t+=+time();

++$t_hex+=+sprintf("%2508x",+$t);
++$m+=+md5($secret.$f.$t_hex);

++#+generate+link
++printf('<a+href="%25s%25s/%25s%25s">%25s</a>',
+++++++++$uri_prefix,+$m,+$t_hex,+$f,+$f);
?>|code-block|syntax|javascript|1674736|当然，根据文件的大小，最好使用Unkwntech建议的readfile()。使用garrow建议的xsendfile是另一个很好的想法，也得到了Apache的支持。|style|CODE|1674737|entityMap|0|LINK|mutability|MUTABLE|url|http://redmine.lighttpd.net/projects/lighttpd/wiki/Docs:ModSecDownload|1|https://stackoverflow.com/questions/597159/sending-large-files-reliably-in-php/597184#597184|2|https://stackoverflow.com/questions/597159/sending-large-files-reliably-in-php/597195#597195^0|Z|E|0|0|0|0|R|A|F|9|1|14|6|2|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|16|8|@$A|17|B|18|M|N]]|9|@$A|19|B|1A|1|1B]|$A|1C|B|1D|1|1E]]|C|$]]|$1|O|3|-4|5|6|7|1F|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]|W|$5|R|S|T|C|$U|X]]|Y|$5|R|S|T|C|$U|Z]]]]

If you are using lighttpd as a webserver, an alternative for secure downloads would be to use <a href="http://redmine.lighttpd.net/projects/lighttpd/wiki/Docs:ModSecDownload" rel="nofollow noreferrer">ModSecDownload</a>. It needs server configuration but you'll let the webserver handle the download itself instead of the PHP script.

Generating the download URL would look like that (taken from the documentation) and it could of course be only generated for authorized users:

<pre><code>&lt;?php

 $secret = "verysecret";
 $uri_prefix = "/dl/";

 # filename
 # please note file name starts with "/" 
 $f = "/secret-file.txt";

 # current timestamp
 $t = time();

 $t_hex = sprintf("%08x", $t);
 $m = md5($secret.$f.$t_hex);

 # generate link
 printf('&lt;a href="%s%s/%s%s"&gt;%s&lt;/a&gt;',
 $uri_prefix, $m, $t_hex, $f, $f);
?&gt;
</code></pre>

Of course, depending on the size of the files, using <code>readfile()</code> such as proposed by <a href="https://stackoverflow.com/questions/597159/sending-large-files-reliably-in-php/597184#597184">Unkwntech</a> is excellent. And using xsendfile as proposed by <a href="https://stackoverflow.com/questions/597159/sending-large-files-reliably-in-php/597195#597195">garrow</a> is another good idea also supported by Apache.

blocks|key|5643602|text|最好的解决方案是依赖轻量级或apache，但如果在PHP中，我会使用PEAR's+HTTP_Download+(不需要重新发明轮子等)，它有一些很好的特性，比如：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5643603|5643604|Basic+throttling+mechanism|unordered-list-item|5643605|Ranges+(partial+downloads+mechanism|5643606|Ranges+resuming)|5643607|+(基本节流和(部分下载和恢复))|5643608|参见intro/usage+docs。|5643609|entityMap|0|LINK|mutability|MUTABLE|url|http://pear.php.net/manual/en/package.http.http-download.php|1|http://pear.php.net/manual/en/package.http.http-download.intro.php^0|Y|K|0|0|0|0|0|0|0|2|G|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|D|3|-4|5|6|7|13|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|14|8|@]|9|@]|C|$]]|$1|H|3|I|5|G|7|15|8|@]|9|@]|C|$]]|$1|J|3|K|5|G|7|16|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|17|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|P|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]]|Q|$R|$5|S|T|U|C|$V|W]]|X|$5|S|T|U|C|$V|Y]]]]

Best solution would be to rely on lighty or apache, but if in PHP, I would use <a href="http://pear.php.net/manual/en/package.http.http-download.php" rel="noreferrer">PEAR's HTTP_Download</a> (no need to reinvent the wheel etc.), has some nice features, like:

<ul>
<li>Basic throttling mechanism</li>
<li>Ranges (partial downloads and resuming)</li>
</ul>

See <a href="http://pear.php.net/manual/en/package.http.http-download.intro.php" rel="noreferrer">intro/usage docs</a>.

blocks|key|2114475|text|我不确定这对于大文件来说是不是一个好主意。如果下载脚本的线程一直运行到用户完成下载，而您运行的是Apache之类的程序，那么只有50个或更多的并发下载就会使服务器崩溃，因为Apache不能同时运行大量长时间运行的线程。当然，如果apache线程以某种方式终止，并且下载在下载过程中位于某个缓冲区中，那么我可能就错了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2114476|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I'm not sure this is a good idea for large files. If the thread for your download script runs until the user has finished the download, and you're running something like Apache, just 50 or more concurrent downloads could crash your server, because Apache isn't designed to run large numbers of long-running threads at the same time. Of course I might be wrong, if the apache thread somehow terminates and the download sits in a buffer somewhere whilst the download progresses.

blocks|key|2114505|text|创建指向实际文件的符号链接，并使下载链接指向该符号链接。然后，当用户单击DL链接时，他们将从实际文件下载一个文件，但从符号链接命名。创建符号链接需要几毫秒，这比尝试将文件复制到新名称并从新名称下载要好得多。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2114506|例如：|2114507|<?php

//+validation+code+here

$realFile+=+"Hidden_Zip_File.zip";
$id+=+"UserID1234";

if+($_COOKIE['authvalid']+==+"true")+{
++++$newFile+=+sprintf("myzipfile_%25s.zip",+$id);+//creates:+myzipfile_UserID1234.zip

++++system(sprintf('ln+-s+%25s+%25s',+$realFile,+$newFile),+$retval);

++++if+($retval+!=+0)+{
++++++++die("Error+getting+download+file.");
++++}

++++$dlLink+=+"/downloads/hiddenfiles/".$newFile;
}

//+rest+of+code

?>

<a+href="<?php+echo+$dlLink;+?>Download+File</a>|code-block|syntax|javascript|2114508|这就是我所做的，因为Go爸爸会在2分30秒后终止脚本的运行，或者so....this会防止这个问题并隐藏实际的文件。|2114509|然后，您可以设置CRON作业以定期删除符号链接...|2114510|然后，整个过程会将文件发送到浏览器，因为它不是脚本，所以它运行多长时间并不重要。|2114511|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Create a symbolic link to the actual file and make the download link point at the symbolic link. Then, when the user clicks on the DL link, they'll get a file download from the real file but named from the symbolic link. It takes milliseconds to create the symbolic link and is better than trying to copy the file to a new name and download from there.

For example:

<pre><code>&lt;?php

// validation code here

$realFile = "Hidden_Zip_File.zip";
$id = "UserID1234";

if ($_COOKIE['authvalid'] == "true") {
 $newFile = sprintf("myzipfile_%s.zip", $id); //creates: myzipfile_UserID1234.zip

 system(sprintf('ln -s %s %s', $realFile, $newFile), $retval);

 if ($retval != 0) {
 die("Error getting download file.");
 }

 $dlLink = "/downloads/hiddenfiles/".$newFile;
}

// rest of code

?&gt;

&lt;a href="&lt;?php echo $dlLink; ?&gt;Download File&lt;/a&gt;
</code></pre>

That's what I did because Go Daddy kills the script from running after 2 minutes 30 seconds or so....this prevents that problem and hides the actual file.

You can then setup a CRON job to delete the symbolic links at regular intervals....

This whole process will then send the file to the browser and it doesn't matter how long it runs since it's not a script.

blocks|key|4225587|text|我使用了在php手册条目的注释中找到的以下代码片段作为readfile：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4225588|function+_readfileChunked($filename,+$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)+{
++++++++++++$cnt+%2B=+strlen($buffer);
++++++++}
++++}
++++$status+=+fclose($handle);
++++if+($retbytes+&&+$status)+{
++++++++return+$cnt;+//+return+num.+bytes+delivered+like+readfile()+does.
++++}
++++return+$status;
}|code-block|syntax|javascript|4225589|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I have used the following snippet found in the comments of the php manual entry for readfile:

<pre><code>function _readfileChunked($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 &amp;&amp; $status) {
 return $cnt; // return num. bytes delivered like readfile() does.
 }
 return $status;
}
</code></pre>

blocks|key|4225610|text|我们已经在几个项目中使用了它，到目前为止它工作得很好：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4225611|/**
+*+Copy+a+file's+content+to+php://output.
+*
+*+@param+string+$filename
+*+@return+void
+*/
protected+function+_output($filename)
{
++++$filesize+=+filesize($filename);

++++$chunksize+=+4096;
++++if($filesize+>+$chunksize)
++++{
++++++++$srcStream+=+fopen($filename,+'rb');
++++++++$dstStream+=+fopen('php://output',+'wb');

++++++++$offset+=+0;
++++++++while(!feof($srcStream))+{
++++++++++++$offset+%2B=+stream_copy_to_stream($srcStream,+$dstStream,+$chunksize,+$offset);
++++++++}

++++++++fclose($dstStream);
++++++++fclose($srcStream);+++
++++}
++++else+
++++{
++++++++//+stream_copy_to_stream+behaves()+strange+when+filesize+>+chunksize.
++++++++//+Seems+to+never+hit+the+EOF.
++++++++//+On+the+other+handside+file_get_contents()+is+not+scalable.+
++++++++//+Therefore+we+only+use+file_get_contents()+on+small+files.
++++++++echo+file_get_contents($filename);
++++}
}|code-block|syntax|javascript|4225612|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

We've been using this in a couple of projects and it works quite fine so far:

<pre><code>/**
 * Copy a file's content to php://output.
 *
 * @param string $filename
 * @return void
 */
protected function _output($filename)
{
 $filesize = filesize($filename);

 $chunksize = 4096;
 if($filesize &gt; $chunksize)
 {
 $srcStream = fopen($filename, 'rb');
 $dstStream = fopen('php://output', 'wb');

 $offset = 0;
 while(!feof($srcStream)) {
 $offset += stream_copy_to_stream($srcStream, $dstStream, $chunksize, $offset);
 }

 fclose($dstStream);
 fclose($srcStream); 
 }
 else 
 {
 // stream_copy_to_stream behaves() strange when filesize &gt; chunksize.
 // Seems to never hit the EOF.
 // On the other handside file_get_contents() is not scalable. 
 // Therefore we only use file_get_contents() on small files.
 echo file_get_contents($filename);
 }
}
</code></pre>

blocks|key|4225614|text|header("Content-length:".filesize($filename));
header('Content-Type:+application/zip');+//+ZIP+file
header('Content-Type:+application/octet-stream');
header('Content-Disposition:+attachment;+filename="downloadpackage.zip"');
header('Content-Transfer-Encoding:+binary');
ob_end_clean();
readfile($filename);
exit();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4225615|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>header("Content-length:".filesize($filename));
header('Content-Type: application/zip'); // ZIP file
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="downloadpackage.zip"');
header('Content-Transfer-Encoding: binary');
ob_end_clean();
readfile($filename);
exit();
</code></pre>

blocks|key|4225633|text|我也遇到过同样的问题，通过在启动session+session_cache_limiter(‘none’)之前添加这个来解决我的问题；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4225634|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I have had same problem,
my problem solved by adding this before starting session
session_cache_limiter('none');

blocks|key|1674840|text|分块文件是PHP中最快/最简单的方法，如果你不能或不想使用一些更专业的东西，如cURL，Apache上的mod-xsendfile或一些dedicated+script。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1674841|$filename+=+$filePath.$filename;

$chunksize+=+5+*+(1024+*+1024);+//5+MB+(=+5+242+880+bytes)+per+one+chunk+of+file.

if(file_exists($filename))
{
++++set_time_limit(300);

++++$size+=+intval(sprintf("%25u",+filesize($filename)));

++++header('Content-Type:+application/octet-stream');
++++header('Content-Transfer-Encoding:+binary');
++++header('Content-Length:+'.$size);
++++header('Content-Disposition:+attachment;filename="'.basename($filename).'"');

++++if($size+>+$chunksize)
++++{+
++++++++$handle+=+fopen($filename,+'rb');+

++++++++while+(!feof($handle))
++++++++{+
++++++++++print(@fread($handle,+$chunksize));

++++++++++ob_flush();
++++++++++flush();
++++++++}+

++++++++fclose($handle);+
++++}
++++else+readfile($path);

++++exit;
}
else+echo+'File+"'.$filename.'"+does+not+exist!';|code-block|syntax|javascript|1674842|从richnetapps.com+/+NeedBee移植。测试了200+MB的文件，在该文件上readfile()已死亡，即使将最大允许内存限制设置为1G，也是下载文件大小的五倍。|1674843|顺便说一句:我也在文件>2GB上测试过，但是PHP只写出了文件的第一个2GB，然后断开了连接。与文件相关的函数(fopen、fread、fseek)使用INT，因此最终达到了2GB的极限。在这种情况下，上述解决方案(即mod-xsendfile)似乎是唯一的选择。|1674844|编辑：Make+yourself+100%25您的文件保存在utf-8__中。如果您忽略了这一点，下载的文件将被损坏。这是因为此解决方案使用print将文件块推送到浏览器。|BOLD|1674845|entityMap|0|LINK|mutability|MUTABLE|url|http://www.phpriot.com/articles/download-with-curl-and-php|1|http://durham.net.au/force-download-large-files-with-php/|2|https://tn123.org/mod_xsendfile/|3|http://phpsnips.com/579/PHP-download-script-for-Large-File-Downloads#.UwdOiWJ5Nfg|4|http://www.richnetapps.com/the-right-way-to-handle-file-downloads-in-php/|5|http://need-bee.com/b/2011/11/downloading-large-files-in-php/^0|1G|D|13|4|0|18|6|1|1G|D|2|1W|G|3|0|0|1B|A|23|2|1|F|4|J|7|5|0|B|4|Z|3|2F|3|31|D|0|H|4|S|5|1W|5|0^^$0|@$1|2|3|4|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@$9|1C|A|1D|1|1E]|$9|1F|A|1G|1|1H]|$9|1I|A|1J|1|1K]|$9|1L|A|1M|1|1N]]|E|$]]|$1|F|3|G|5|H|7|1O|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1P|8|@$9|1Q|A|1R|B|C]|$9|1S|A|1T|B|C]]|D|@$9|1U|A|1V|1|1W]|$9|1X|A|1Y|1|1Z]]|E|$]]|$1|M|3|N|5|6|7|20|8|@$9|21|A|22|B|C]|$9|23|A|24|B|C]|$9|25|A|26|B|C]|$9|27|A|28|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|29|8|@$9|2A|A|2B|B|Q]|$9|2C|A|2D|B|C]|$9|2E|A|2F|B|C]]|D|@]|E|$]]|$1|R|3|-4|5|6|7|2G|8|@]|D|@]|E|$]]]|S|$T|$5|U|V|W|E|$X|Y]]|Z|$5|U|V|W|E|$X|10]]|11|$5|U|V|W|E|$X|12]]|13|$5|U|V|W|E|$X|14]]|15|$5|U|V|W|E|$X|16]]|17|$5|U|V|W|E|$X|18]]]]

Chunking files is the fastest / simplest method in PHP, if you can't or don't want to make use of something a bit more professional like <a href="http://www.phpriot.com/articles/download-with-curl-and-php" rel="noreferrer">cURL</a>, <a href="https://tn123.org/mod_xsendfile/" rel="noreferrer"><code>mod-xsendfile</code></a> on <a href="http://durham.net.au/force-download-large-files-with-php/" rel="noreferrer">Apache</a> or some <a href="http://phpsnips.com/579/PHP-download-script-for-Large-File-Downloads#.UwdOiWJ5Nfg" rel="noreferrer">dedicated script</a>.

<pre><code>$filename = $filePath.$filename;

$chunksize = 5 * (1024 * 1024); //5 MB (= 5 242 880 bytes) per one chunk of file.

if(file_exists($filename))
{
 set_time_limit(300);

 $size = intval(sprintf("%u", filesize($filename)));

 header('Content-Type: application/octet-stream');
 header('Content-Transfer-Encoding: binary');
 header('Content-Length: '.$size);
 header('Content-Disposition: attachment;filename="'.basename($filename).'"');

 if($size &gt; $chunksize)
 { 
 $handle = fopen($filename, 'rb'); 

 while (!feof($handle))
 { 
 print(@fread($handle, $chunksize));

 ob_flush();
 flush();
 } 

 fclose($handle); 
 }
 else readfile($path);

 exit;
}
else echo 'File "'.$filename.'" does not exist!';
</code></pre>

Ported from <a href="http://www.richnetapps.com/the-right-way-to-handle-file-downloads-in-php/" rel="noreferrer">richnetapps.com</a> / <a href="http://need-bee.com/b/2011/11/downloading-large-files-in-php/" rel="noreferrer">NeedBee</a>. Tested on 200 MB files, on which <code>readfile()</code> died, even with maximum allowed memory limit set to <code>1G</code>, that is five times more than downloaded file size.

BTW: I tested this also on files <code>&gt;2GB</code>, but PHP only managed to write first <code>2GB</code> of file and then broke the connection. File-related functions (fopen, fread, fseek) uses INT, so you ultimately hit the limit of <code>2GB</code>. Above mentioned solutions (i.e. <code>mod-xsendfile</code>) seems to be the only option in this case.

EDIT: Make yourself 100% that your file is saved in <code>utf-8</code>. If you omit that, downloaded files will be corrupted. This is, because this solutions uses <code>print</code> to push chunk of a file to a browser.

blocks|key|4225699|text|这是在内存限制为256MB的服务器上对200%2B+MB大小的文件进行测试的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4225700|header('Content-Type:+application/zip');
header("Content-Disposition:+attachment;+filename=\"$file_name\"");
set_time_limit(0);
$file+=+@fopen($filePath,+"rb");
while(!feof($file))+{
++print(@fread($file,+1024*8));
++ob_flush();
++flush();
}|code-block|syntax|javascript|4225701|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is tested on files of a size 200+ MB on a server that has 256MB memory limit.

<pre><code>header('Content-Type: application/zip');
header("Content-Disposition: attachment; filename=\"$file_name\"");
set_time_limit(0);
$file = @fopen($filePath, "rb");
while(!feof($file)) {
 print(@fread($file, 1024*8));
 ob_flush();
 flush();
}
</code></pre>

I have a php script on a server to send files to recipents: they get a unique link and then they can download large files. Sometimes there is a problem with the transfer and the file is corrupted or never finishes. I am wondering if there is a better way to send large files

Code:

<pre><code>$f = fopen(DOWNLOAD_DIR.$database[$_REQUEST['fid']]['filePath'], 'r');
while(!feof($f)){
 print fgets($f, 1024);
}
fclose($f);
</code></pre>

I have seen functions such as

<pre><code>http_send_file
http_send_data
</code></pre>

But I am not sure if they will work.

What is the best way to solve this problem?

Regards 
erwing

Downloading large files reliably in PHP

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在服务器上有一个php脚本来发送文件给食客:他们得到一个唯一的链接，然后他们可以下载大文件。有时传输出现问题，文件已损坏或永远不会完成。我想知道是否有更好的方式发送大文件代码：$f = fopen(DOWNLOAD_DIR.$database[$_REQUEST['fid']]['filePath'], 'r');w...

问在PHP中可靠地下载大文件
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