Given the following code:

unset($list);
foreach($list as $value)
{
   print($value);
}

and $list is FALSE, PHP is generating an error like
"Non array argument supplied for foreach()".  The
variable probably should be promoted to being an
empty array, but I can deal with casting it myself.
Unfortunately, when I do this:

unset($list);
foreach((array)$list as $value)
{
   print($value);
}

it runs through the loop once.  I know I can get around
this using a while loop, but I'd prefer to use foreach.

If anyone's wondering why the hell I'm looping over an
unset variable, I have a caching function that returns
the contents of a database table.  When there are no
rows, it returns the unset static variable.