删除一个文件或清空一个文件夹

function delfile($filename){    if (!file_exists($filename)) {        return;    }

    if (!is_dir($filename)) {        unlink($filename);        return;    }

    if (($handle = opendir($filename))) {        while (($item = readdir($handle))) {            if ($item != "." && $item != "..") {                $fullpath = $filename . ‘/‘ . $item;                if (!file_exists($fullpath)) {                    continue;                }

                if (is_dir($fullpath)) {                    delfile($fullpath);                    rmdir($fullpath);                } else {                    unlink($fullpath);                }            }        }        closedir($handle);    }}