Only had coding style comments. It's ok otherwise.

/trunk/common/db/task_rating.php (Diff revision 1)

Delete this if it's not necessary.

/trunk/common/db/task_rating.php (Diff revision 1)

function ...) {
}

/trunk/common/db/task_rating.php (Diff revision 1)

foreach ($ratings

/trunk/common/db/task_rating.php (Diff revision 1)

We generally do it "task_id = sth" (add spaces)

You can remove the ;

/trunk/common/db/task_rating.php (Diff revision 1)

It's not really a query... you can call it values :)

Are you sure this is enough? I don't see any task_rating_get function.

/trunk/common/db/task_rating.php (Diff revision 1)

this should go in common/task_rating.