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    $filename = "./".$_REQUEST['name']; //ÕaÀiÊÇ*a¸ç¾ßÌaÂ*¾¶,Ö»Òª$filenameÊÇËuÒªÏÂÔØÎļþµÄÍeÕuÂ*¾¶¾Í¿ÉÒÔ.
    if (!is_file($filename)) {//¼i²aÎļþÊÇ*ñ´aeÔÚ.
     die('ÏÂÔصÄÎļþºÃÏñ¸uTM˭˽±¼À²!');
    }
    $filepath = str_replace('\\', '/', realpath($filename));
    $filesize = filesize($filepath);
    $filename = substr(strrchr('/'.$filepath, '/'), 1);
    $extension = strtolower(substr(strrchr($filepath, '.'), 1));
           // use this unless you want to find the mime type based on extension,Îļþºo׺¸ñʽ,²»½aÊÍ.
    $mime = array('application/octet-stream');
    header('Content-Type: '.$mime);
    header('Content-Disposition: attachment; filename="'.$filename.'"');
    header('Content-Transfer-Encoding: binary');
    header('Content-Length: '.sprintf('%d', $filesize));
    header('Expires: 0');
    // check for IE only headers,¿ÓµuµÄIE¼i²a,Äa¶®µÄ.
    if (isset($_SERVER['HTTP_USER_AGENT']) &&((strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false)))
    {
     header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
     header('Pragma: public');
    }
    else
    {
     header('Pragma: no-cache');
    }
    $handle = fopen($filepath, 'rb');
    fpassthru($handle);
    fclose($handle);

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