PHP header readfile download

$filename為路徑名稱+檔案名稱。

ex: ./xml/POI.xml

ex: ./pic/xxx.jpg

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$filename = ./xml/POI.xml;

header("Pragma: public");

header("Expires: 0");

header("Cache-Control: must-revalidate, post-check=0, pre-check=0");

header("Cache-Control: private",false);

header("Content-Type: application/force-download");

header("Content-Disposition: attachment; filename=\"".basename($filename)."\";" );

header("Content-Transfer-Encoding: binary");

header("Content-Length: ".filesize($filename));

readfile("$filename");

exit();