Problems downloading files over about 30Mb via PHP

[Gideon-IT]

I'm a newbie to PHP but I want to amend a website I run for a musician friend of mine so that when people purchase his albums (sold as ZIP files) they don't see the link to the actual file, but PHP generates a randomly named copy, then downloads it for them and then deletes the copy when complete.  All works well except the download.  With the large files the download goes to about 1/2 way through and then just stalls until it aborts. 

 

Here's the code...

 

<?php
$path = "../_downloads/"; // change the path to fit your websites document structure
$fullPath = $path.$_GET['file'];

if ($fd = fopen ($fullPath, "r")) {
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);
    switch ($ext) {
        case "zip":
        header("Content-type: application/zip"); // add here more headers for diff. extensions
        header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\""); // use 'attachment' to force a download
        break;
        default;
        header("Content-type: application/octet-stream");
        header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
    }
    header("Content-length: $fsize");
    header("Cache-control: private"); //use this to open files directly
    stream_set_timeout($fd, 600);
    while(!feof($fd)) {
        $buffer = fgets($fd,8192);
        echo $buffer;
    }
}
$info = stream_get_meta_data($fd);
fclose ($fd);

if ($info['timed_out']) {
    echo 'Connection timed out!';
} else {
    echo 'Done';
}
    
exit;
// example: place this kind of link into the document where the file download is offered:
// <a href="download.php?file=some_file.pdf">Download here</a>

?>

 

The link to run it is below...

www.godfreyb.com/_scripts/download.php?file=cd12_vg.zip

 

I've tried the @readfile(); function and this does the same thing, get to about 60.5 Mb and stalls.  I even tried passthru('cat ' . $fullPath); to send the file and that doesn't send anything at all.

 

The site is hosted by FastHosts on a Windows 2008 server with PHP5 installed.

 

Directly linking to the ZIP file results in a perfect download everytime.

 

Can anyone suggest a way to get this working?  It's driving me nuts!

[Adam]

How long does it take for execution to stop? You're increasing the time out of the stream, but not the PHP execution itself. You'll possibly need to just increase the max execution time.

[Gideon-IT]

How do I do that?  It's worth a try!

 

[Gideon-IT]

To avoid being a lazy arse I looked it up on Google!  I've added the following lines to the beginning of the script...

 

 

ini_set('max_execution_time', 1200);

ini_set('memory_limit','1024M');

 

And am re-testing.

[Adam]

Yup, or using set_time_limit.

 

Forgot to add, because you're on a Windows server this is the case. On Linux the max execution time doesn't include stream operations, which you had increased the time-out of. I suspect you wouldn't be getting this problem on Linux.

[Gideon-IT]

Adam,

 

Well thanks to your excellent suggestions we've moved forward somewhat.  Now I get 132Mb of my 156Mb download - but still not all of it!  The modified code is below.  Any other ideas?

 

 

<?php

 

 

ini_set('max_execution_time', 1200);

ini_set('memory_limit','256M');

set_time_limit(1200);

 

$path = "../_downloads/"; // change the path to fit your websites document structure

$fullPath = $path.$_GET['file'];

 

if ($fd = fopen ($fullPath, "r")) {

    $fsize = filesize($fullPath);

    $path_parts = pathinfo($fullPath);

    $ext = strtolower($path_parts["extension"]);

    switch ($ext) {

        case "zip":

        header("Content-type: application/zip"); // add here more headers for diff. extensions

        header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\""); // use 'attachment' to force a download

        break;

        default;

        header("Content-type: application/octet-stream");

        header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");

    }

    header("Content-length: $fsize");

    header("Cache-control: private"); //use this to open files directly

    stream_set_timeout($fd, 1200);

    ob_clean();

    flush();

    while(!feof($fd)) {

        $buffer = fgets($fd,1024);

        echo $buffer;

    }

}

$info = stream_get_meta_data($fd);

fclose ($fd);

 

if ($info['timed_out']) {

    echo 'Connection timed out!';

} else {

    echo 'Done';

}

 

   

exit;

// example: place this kind of link into the document where the file download is offered:

// <a href="download.php?file=some_file.pdf">Download here</a>

 

?>

 

[Gideon-IT]

For full PHP info see here...

 

http://godfreyb.com/_scripts/test.php