/**
* Deletes the flash entries that were not marked for keeping.
*
*/
function sweep()
{
global $sess, $flash;
if (!$sess->is_registered('flash')) {
$flash = new Flash();
$sess->register('flash');
}
// actually sweep
$keys = array_keys($flash->flash);
foreach ($keys as $k) {
if (!$flash->used[$k]) {
$flash->_use($k);
} else {
unset($flash->flash[$k]);
unset($flash->used[$k]);
}
}
// cleanup if someone meddled with flash or used
$fkeys = array_keys($flash->flash);
$ukeys = array_keys($flash->used);
foreach (array_diff($fkeys, $ukeys) as $k => $v) {
unset($flash->used[$k]);
}
// serialize it
$flash = base64_encode(serialize($flash));
}