Force a header to appear on every htm, html, and php file on

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I am trying to offer free hosting to some folks in my area. I would need to have a banner on each page to help offset costs. How can I make it so every htm, html, and php file created on the machine gets the header I choose added to it?

Thanks!

[Juanra]

You might search for [u:5974bd2087]mod_layout[/u:5974bd2087]

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I actually saw that when searching the forums here. I then researched it via google and there is no documentation on how to set it up server wide. Someone here told how to use it for one domain, but I need it to add the header to every single file on every single domain.