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$filename = "/somepath/".$_GET['file'].".txt"; //ÒªÏÂÔØµÄÎļþÃû
header("Content-Type: application/force-download");
header("Content-Disposition: attachment; filename=".basename($filename));
readfile($filename);
?>
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/*** Function: PHP header() examples (PHP)
**
Desc: Some examples on how to use the header() function of PHPYou find
a detailed tutorial at expertsrt.com (English) or at ffm.junetz.de
(German).These is also a good help about caching at web-caching.com.
**
Example: see below.
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