How to replace a file with another file of the same name that has new content in PHP?

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I am new to PHP. In my application user when clicks for PDF, a copy on his name will be stored in a server. Next time, when he wants another PDF of different data, even that also will be stored on the same name in the server. I want to replace the old copy with the new PDF. Please tell me how to solve it. Thank You.


Use copy($source, $dest) and the destination will always be overwritten if it exists.

See: http://www.php.net/manual/en/function.copy.php