Question

I have this code here to allow the users to download files over my server:

$ch_2 = curl_init();
curl_setopt($ch_2, CURLOPT_USERAGENT, 'Mozilla/4.0');
curl_setopt($ch_2, CURLOPT_URL, $download_link);
curl_setopt($ch_2, CURLOPT_AUTOREFERER, true);
curl_setopt($ch_2, CURLOPT_BINARYTRANSFER, true);
curl_setopt($ch_2, CURLOPT_COOKIESESSION, false);
curl_setopt($ch_2, CURLOPT_FAILONERROR, true);
curl_setopt($ch_2, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch_2, CURLOPT_FORBID_REUSE, true);
curl_setopt($ch_2, CURLOPT_FRESH_CONNECT, true);
curl_setopt($ch_2, CURLOPT_NOSIGNAL, true);
curl_setopt($ch_2, CURLOPT_RETURNTRANSFER, false);
curl_setopt($ch_2, CURLOPT_CONNECTTIMEOUT, 60);
curl_setopt($ch_2, CURLOPT_TIMEOUT, 86400);
curl_setopt($ch_2, CURLOPT_LOW_SPEED_LIMIT, 10240);
curl_setopt($ch_2, CURLOPT_LOW_SPEED_TIME, 60);
curl_setopt($ch_2, CURLOPT_MAX_RECV_SPEED_LARGE, 500);
curl_exec($ch_2);
$curl_errno_2 = curl_errno($ch_2);
curl_close($ch_2);

Theese files (linked in $download_link) are very big, around 1-3 GB.

This code works fine, but my problem is, when a user disconnects or abort the download then the script doesn’t stop until the server has received the full file ($download_link).

If I set “ignore_user_abort(true)”, then the script stops, but is it possible to check a client disconnection or download abort in the script and can handle this? For example, update a MySQL database entry or something else?

I know I can change this code by using “readfile()” or fopen, fread for example, but I will (and must) use this cURL code.

Is it possible to check this user disconnection or download abort, because I will only allow the user to make one download connection per IP address? So if they abort a download I can not update my MySQL database to mange the download connections form this IP address.

Answer 1

You can register a shutdown function. This will be called when the script finishes, when the user aborts or when you call exit() or die(). http://php.net/manual/en/function.register-shutdown-function.php

For example, (from php.net):

<?php
    function shutdown()
    {
        // This is our shutdown function, in
        // here we can do any last operations
        // before the script is complete.

        echo 'Script executed with success', PHP_EOL;
    }

    register_shutdown_function('shutdown');
?>

That’s the closest you’re going to get.

“because I will only allow the user to make one download connection per IP address?”

I would suggest you do this:

1. Use APC to store an IP address that is currently downloading something
2. Register a shutdown function to remove the IP address from APC allowing them to download something else