File field is showing that my previously uploaded files are 0 bytes - drupal

Question

Got a bit of a weird issue here. I recently started doing maintenance on a website that I did not originally build. The Drupal site has a bunch of nodes with an audio file field, and a jQuery player that plays them. On a lot of the nodes the player does not load, and I've realized this is because the file is reported as being 0 bytes when I edit the node. I'm not sure why this is. At first I was thinking it might be a file permissions thing, but I don't think thats the case as the permissions look fine to me. To fix it all I had to do was re-upload the file. Problem is that there are hundreds of these files and I'd like to fix it just by making one update if that is possible.

Answer 1

Here is a working version of Terry's pseudocode for Drupal 7.
$fids = db_query('SELECT fid FROM {file_managed} WHERE filesize = 0')->fetchCol();
foreach(file_load_multiple($fids) as $file) {
// Get full path to file.
$target = drupal_realpath($file->uri);
// If the file does not exist try the next file.
if (!file_exists($target)) {
echo "File $file->uri does not exist." .PHP_EOL;
continue;
}
// Find and store size of file
$file->filesize = filesize($target);
// Size of file is
if ($file->filesize > 0) {
file_save($file);
}
else {
echo "Size of $file->uri is still zero." . PHP_EOL;
}
}
Run it with drush:
drush php-script fix-file-sizes.php

Answer 2

We had the same problem: a lot of 0 byte files in the database.
What we did looked something like this:
function update_my_filesizes() {
$fileIDs = db_query('SELECT fid FROM {file_managed) WHERE filesize = 0')->fetchCol();
foreach(file_load_multiple($fids) as $file) {
// determine size of file
$filesize = SIZE_OF_THE_FILE; (pseudocode, we had to use filesize())
$file->filesize = $filesize;
if($file->filesize > 0) {
file_save($file);
} else {
echo "Filesize for file <filename here> is still 0 :(";
}
}
}