Trying to make an icon appear next to a thread if a user has posted...

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And this is what I've tried so far. In "functions_forumdisplay.php" I've added these lines of code:

PHP Code:

        if ($thread['threadid'] == $dotthreads["$thread[threadid]"])
        {
        $show['hasposted'] = true;
        } 


and then in my threadbit template I have a simple conditional saying if $show['hasposted'], display this image, but it's not working. The problem is in the conditional in the PHP file, and I can't figure this out for the life of me. I guess I just need to check to see if the current threadid is in the array of dotthreads? Any help would be much, much appreciated.