Php FPDF中的Mysql表

我使用fpdf生成pdf发票。首先连接数据库，然后加载数据。但是我打印的页面总是空的

我的连接代码：

$con = mysql_connect("localhost","svenodj118_mrbs","diepenheim");

if (!$con)
{
  die('Could not connect: ' . mysql_error());
}

mysql_select_db("svenodj_118_mrbs", $con);

$result = mysql_query('
    SELECT *
    FROM `mrbs_entry`
    WHERE start_time >= UNIX_TIMESTAMP(CURRENT_DATE - INTERVAL 7 DAY)
        AND start_time < UNIX_TIMESTAMP(CURRENT_DATE + INTERVAL 1 DAY)
        AND create_by = "sven" 
    ORDER BY `start_time`, `room_id`
');

WHILE ($rows = mysql_fetch_array($result)) {
    $date = date("d/m/y", $rows['start_time']);   
    $time = date("H", $rows['end_time'])*60;
    $time += date("i", $rows['end_time']);
    $time2 = date("H", $rows['start_time'])*60;
    $time2 += date("i", $rows['start_time']);
    $time3 = ($time-$time2)/60;
    switch($rows['room_id'])
    {
        case 1:
            $room = "Grote Zaal";
            $prijs = $time3*10;
            break;
        case 2:
            $room = "Kleine Zaal";
            $prijs = $time3*5;
            break;
    }
    $totaalprijs += $prijs;
    var_dump($sql_result3);
    $pdf->ln();
    $pdf->SetXY(10,100);
    $pdf->cell(50,10,$room,0,0,'C',true);
    $pdf->SetXY(60, $hoogte+25);
    $pdf->cell(50,10,$date2,0,0,'C',true);
    $pdf->SetXY(100, $hoogte+25);
    $pdf->cell(50,10,$time3,0,0,'C',true);
    $pdf->SetXY(150, $hoogte+25);
    $pdf->cell(50,10,$prijs,0,0,'C',true);
    $hoogte+=25;
}
mysql_close();

编辑

完整代码为：

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您是否执行了$pdf->Output（）？同时启用错误报告以检查是否存在任何PHP错误。请。已在PHP7中删除。了解使用PDO的语句，并考虑使用PDO。我使用输出。