incrementing a number from a text file

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To: php-general@xxxxxxxxxxxxx
Subject: incrementing a number from a text file
From: "Ross Hulford" <ross@xxxxxxxxxxxxx>
Date: Wed, 9 Mar 2005 23:16:21 -0000
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I want to read a number from an external (txt) file and increment it.then 
save the number back on the text file.
I know this is possible but want a simple amd economical way to do this.

Thanks,


Ross 

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