PHP: Stream Download

A general php code to download any type of file:

header("Content-Type: application/octet-stream"); 
header("Content-Length: " . filesize($filename)); 
header("Content-Disposition: attachment; filename=\"$filename\""); 

content-type defines the type of file being sent. application/octet-stream is used for any kind of files.

content-length indicates the size of information. this is to let browser know how much data to download in advance and ensure

content-disposition is used to suggest the file name to be saved. the filename should have the correct extension so that the browser knows the default application associated with this extension.

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