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As Berto suggests I would sprinkle some error checking points in your script, one inside each if/else/loop/part of loop saying something like;
echo "execution reached checkpoint 1";
etc.
it can help you know if your logic is faulty and where the execution flow is and isn't going.
Also echo out all your get & post variables, maybe your script isn't being passed what you think it is.
If you actually have an error, like a syntax error in your script, the PHP parser will return an error message to your web server (Apache) to display, usually something like 'Parse error at line: 53, unexpected T-string', or whatever.
If you have something like MySQL on your server, check what's in your database and make sure your field names match your SQL statements.
Hope this helps,
J.
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