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1. strip_tags always removes PHP tags.
2. strpos never returns true.
There is no way you got that message.
3. There are no "exploits" for pure CSS. There's nothing to protect against besides poor design.
(Unless you do something silly like try to run the CSS through a PHP parser...)
I'm creating a php game maker where I am allowing people to fully edit the css of the site for there game only. So I don't want no malicous stuff inserted.