This hook allows a module to control the maximum file size for a file upload. Most notable would be file system storage. It could ignore the db_limit.

Call time:

In include/upload_functions.php, in the function phorum_get_system_max_upload.

Hook input:

An array containing the default limit, the data layer limit and the PHP limit

Hook output:

A 3 part array with the limits adjusted as you wish. The first element in the array would be the most important.

Example code:

function phorum_mod_foo_system_max_upload($data)
{
    // ignore the db_limit
    $data[0] = $data[2];
    return $data;
}