think\File::move PHP Method

    public function move($path, $savename = true, $replace = true)
    {
        // 文件上传失败，捕获错误代码
        if (!empty($this->info['error'])) {
            $this->error($this->info['error']);
            return false;
        }
        // 检测合法性
        if (!$this->isValid()) {
            $this->error = '非法上传文件';
            return false;
        }
        // 验证上传
        if (!$this->check()) {
            return false;
        }
        $path = rtrim($path, DS) . DS;
        // 文件保存命名规则
        $saveName = $this->buildSaveName($savename);
        $filename = $path . $saveName;
        // 检测目录
        if (false === $this->checkPath(dirname($filename))) {
            return false;
        }
        /* 不覆盖同名文件 */
        if (!$replace && is_file($filename)) {
            $this->error = '存在同名文件' . $filename;
            return false;
        }
        /* 移动文件 */
        if ($this->isTest) {
            rename($this->filename, $filename);
        } elseif (!move_uploaded_file($this->filename, $filename)) {
            $this->error = '文件上传保存错误！';
            return false;
        }
        // 返回 File对象实例
        $file = new self($filename);
        $file->setSaveName($saveName);
        $file->setUploadInfo($this->info);
        return $file;
    }