[code]<?phpfunction is_common($inc) { $root_dir = ["adm", "bbs", "extend"]; $dir_count = 0; foreach ($root_dir as $g5_dir) if (is_dir($inc.$g5_dir)) $dir_count += 1; return $dir_count == count($root_dir);}if (is_common("./")) $common_include = "./c…