如何以递归方式删除PHP中的目录及其全部内容(文件+子目录)？

function delete_directory($dirname) {
    if (is_dir($dirname)) {
        $objects = scandir($dirname);
        foreach ($objects as $object) {
            if ($object != "." && $object != "..") {
                if (is_dir($dirname . DIRECTORY_SEPARATOR . $object) && !is_link($dirname . DIRECTORY_SEPARATOR . $object)) {
                    delete_directory($dirname . DIRECTORY_SEPARATOR . $object);
                } else {
                    unlink($dirname . DIRECTORY_SEPARATOR . $object);
                }
            }
        }
        rmdir($dirname);
    }
}

$directory = "path/to/directory";
delete_directory($directory);