birgunj birgunj wrote:
Dear All,
can any body tell me how to prevent documents from download using php. thanks to all

You don't.

If a document is available on the web server it can be downloaded.

If you provide a bit more background, there are tricks you can do with PHP to restrict access to files, but those files must NOT be publicly accessible, you basically make your php script the intermediary between the browser and the file.
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