Get latest revision number for web app

I am using svn to track changes/version of a web application. I would
like to be able to dynamically embed the revision number of the checkout
code into the applications homepage using php. Does anyone know if this
is possible or how this could be done.

What i have in mind is, that the code is checkout into a web directory
and i want the apps homepage to display that revision number. In the
mean time, i will continue updates on a working copy, making commits
until i make another release of the app and check it out to the web
directory again. I suppose i could just manually edit the file in web
directory to display the checkout revision number, but this seems quite
hacky.

Thanks
Nathan

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