php,通过header头强制浏览器下载保存文件

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 public function actionDownload()
    {
        $filename = $this->requestData['filename'];
        //$filename = 'https://storage.sw.com/image/027f2741131d72c04ca7c999639a1c0d.png';
        $content=file_get_contents($filename);//将文件读入字符串
        $length=strlen($content);//取得字符串长度，即文件大小，单位是字节
        $encoded_filename = rawurlencode($filename);//采用rawurlencode避免空格被替换为+
        $ua = $_SERVER["HTTP_USER_AGENT"];//获取用户浏览器UA信息

        header('Content-Type: application/octet-stream');//告诉浏览器输出内容类型，必须
        header('Content-Encoding: none');//内容不加密，gzip等，可选
        header("Content-Transfer-Encoding: binary" );//文件传输方式是二进制，可选
        header("Content-Length: ".$length);//告诉浏览器文件大小，可选

        if (preg_match("/MSIE/", $ua)) {//从UA中找到MSIE判断是IE
            header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
        } else if (preg_match("/Firefox/", $ua)) {//同理判断火狐
            header('Content-Disposition: attachment; filename*="utf8\'\'' . $filename . '"');
        } else {//其他情况，谷歌等
            header('Content-Disposition: attachment; filename="' . $filename . '"');
        }
        echo $content;

    }

差不多就是这样,浏览器直接下载到本地