I am getting a similar error with that same 'onlineoffline.php' file, but I have never installed easyphp. Also, I had my installation running fine, then reinstalled WAMP. Now when I attempt to access php pages I just see the code.
My error log contains this:
[22-Nov-2006 23:56:07] PHP Warning: fclose(): supplied argument is not a valid stream resource in C:\wamp\scripts\onlineoffline.php o
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