The PHP file is PERFECTLY Fine

.
Either:
*You are not using the proper link pointing towards the toplist, yet alone the sinfo.php itself
*You renamed the sinfo.php and so there might be some problem which I cannot think of at the moment lol.
That's the 2 main problems I could think of. Could it be that in your url forums comes before the main url? I even tried the other way round though and still its blank.