远程下载文件，图片,pdf等都可以

    //缓冲区
    ob_end_clean();
    ob_start();
    $file = file_get_contents($url);//$url ---http或者httpsl链接或者本地地址
    header("Content-type:application/octet-stream");
    $filename = pathinfo($url,PATHINFO_BASENAME);
    header("Content-Disposition:attachment;filename=" . $filename);
    header("Accept-ranges:bytes");
    ob_end_flush();
    exit($file);

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