Ahem... I have a feeling I'll get shot, stabbed and hung for this,
buuuuuut... There's really no need for require_once in __autoload,
because if you've reached the __autoload function, the class is
obviously not present (no sense making php check for it a second
time). Also, if you're including from the same directory, use './'.
$class_name.'.php', that way php won't look in the includes paths.