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function get_target_filename($type, $extid = 0, $forcename = '') {
if($type == 'group' || ($type == 'common' && $forcename != '')) {
$filename = $type.'_'.intval($extid).($forcename != '' ? "_$forcename" : '');
} else {
$filename = date('His').strtolower(random(16));
}
return $filename;
}