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Originally Posted by Stefan
there are a lot of articles on this topic. you should do a google on "php security" or something like that.
very important things to notice are filetype checking when you have a file upload, cross site scripting issues (functions like htmlspecialchars and htmlentities are useful here) and interaction with the database (addslashes (for things going into the database) and stripslashes (for things coming out of the database) are useful here).
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Thank you, I found the subject article by John Coggeshall.