class making page blank

[sabret00the]

this is my first ever class so i'm not sure why it's going wrong or where but hey it's the only way i'll learn right?

could someone tell me where i'm going wrong, it's based off of Boofo's stats serialize hack

PHP Code:

<?php

class DoStats
{

    var $prs_stats = array();
    var $updatetime;
    // var TIMENOW;

    function DoStats($prs_stats, $updatetime)
    {
        $this->updatetime = $updatetime;
        //$this->prs_stats = $prs_stats;

        if (!$this->prs_stats['lastupdate'])
        {
            $this->prs_stats['lastupdate'] = 0;
        }

        if ($prs_stats['lastupdate'] == 0 OR ($prs_stats['lastupdate'] + ($this->updatetime * 60)) < TIMENOW)
        {
            $starttime = mktime(0, 0, 0, date('m'), date('d'), date('Y'));

            // Total Pieces
            $stats_totalpieces = @$DB_site->query_first("
                SELECT COUNT(*) AS count
                FROM prs_pieces
            ");

            // Total Reviews
            $stats_totalreviews = @$DB_site->query_first("
                SELECT COUNT(*) AS count
                FROM prs_reviews
            ");
    
            // Average Rating
            $stats_avgrate = @$DB_site->query_first("
                SELECT AVG(rating) AS avg
                FROM prs_rating
            ");

            // Top Rated Piece
            $stats_toprated = @$DB_site->query_first("
                SELECT COUNT(prs_ratings.rating) AS count, *
                FROM prs_ratings
                LEFT JOIN prs_pieces ON (prs_pieces.pieceid = prs_rating.pieceid)
                ORDER BY count
                DESC LIMIT 1
            ");

            // might need to change this into a quick query of select from piece 'review_count' order by review count
            // Top Reviewed
            $stats_topreviewed = @$DB_site->query_first("
                SELECT COUNT(prs_reviews.pagetext) AS count, *
                FROM prs_reviews
                LEFT JOIN prs_pieces ON (prs_pieces.pieceid = prs_reviews.pieceid)
                ORDER BY count
                DESC LIMIT 1
            ");

            // Top Viewed
            $stats_topviewed = @$DB_site->query_first("
                SELECT *
                FROM prs_views
                ORDER BY views
                DESC LIMIT 1
            ");

            // Top Poster
            $stats_topposter = @$DB_site->query_first("
                SELECT *
                FROM prs_user
                ORDER BY pieces DESC
                LIMIT 1
            ");

            // Top Reviewer
            $stats_topreviewer = @$DB_site->query_first("
                SELECT *
                FROM prs_user
                ORDER BY reviews DESC
                LIMIT 1
            ");

            $prs_stats['totalpieces'] = intval($stats_totalpieces[count]);
            $prs_stats['totalreviews'] = intval($stats_totalreviews[count]);
            $prs_stats['avgrate'] = intval(ceil($stats_avgrate[avg]));
            $prs_stats['toprated'] = $stats_toprated[title];
            $prs_stats['toprated_pieceid'] = intval($stats_toprated[pieceid]);
            $prs_stats['topreviewed'] = $stats_topreviewed[title];
            $prs_stats['topreviewed_pieceid'] = intval($stats_topreviewed[pieceid]);
            $prs_stats['topviewed'] = $stats_topviewed[title];
            $prs_stats['topviewed_pieceid'] = intval($stats_topviewed[pieceid]);
            $prs_stats['topposter'] = $stats_topposter[username];
            $prs_stats['topposterid'] = intval($stats_topposter[userid]);
            $prs_stats['topreviewer'] = $stats_topreviewer[username];
            $prs_stats['topreviewerid'] = intval($stats_topreviewer[userid]);

            $prs_stats['lastupdate'] = intval(TIMENOW);

            $DB_site->query ("
                REPLACE INTO " . TABLE_PREFIX . "datastore(title, data)
                VALUES ('prs_stats', '" . addslashes(serialize($prs_stats)) . "')
            ");

            $this->DoStats = $prs_stats;
            // should return the array prs_stats
        }
        else
        {
            $this->DoStats = $prs_stats;
            //return array prs_stats;
        }
        return $this->DoStats;
    }

    function StatsFormat($prs_stats)
    {
        foreach($prs_stats AS $key => $value)
        {
            if (is_numeric($value))
            {
                $this->GetStats[] = vb_number_format($value);
            }
            else
            {
                $this->GetStats[] = $value
            }
        }
        return $this->GetStats;
    }
}

?>