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I had some trouble with including PHP code in a block.
I solved it by using an iframe.
Maybe it will help you too.
Here's my code :
Just change the SRC to your file URL (i.e "SRC={X_SITEURL}scroll.php") and adjust the height and width to suit.
BTW: I think you don't need a leading "/" after the {X_SITEURL}.
I saved it as an HTML block.
does that work for you?