org\Upload::__construct PHP Method

    public function __construct($config = [], $driver = '', $driverConfig = null)
    {
        /* 获取配置 */
        $this->config = array_merge($this->config, $config);
        /* 设置上传驱动 */
        $this->setDriver($driver, $driverConfig);
        /* 调整配置，把字符串配置参数转换为数组 */
        if (!empty($this->config['mimes'])) {
            if (is_string($this->mimes)) {
                $this->config['mimes'] = explode(',', $this->mimes);
            }
            $this->config['mimes'] = array_map('strtolower', $this->mimes);
        }
        if (!empty($this->config['exts'])) {
            if (is_string($this->exts)) {
                $this->config['exts'] = explode(',', $this->exts);
            }
            $this->config['exts'] = array_map('strtolower', $this->exts);
        }
    }