写文件时神秘的数字串

我有一个简单的过程来创建一个包含数据库数据的CSV文件.

if (isset($_POST['submitcsv'])) {
     $csvfile = fopen("stardata.csv", "w"); //w=write, r=read, a=append
     $datebeginning = date('Y/m/d', strtotime($_POST['datebeginning']));
     $query = $pdoace->prepare("SELECT * 
                        FROM `starrisk` 
                        WHERE `testdate` >= ? 
                        AND `site` = '". $_POST['fromlocation'] ."'   
                        ORDER BY `cdcnumber` ASC"); 
        $query->execute(array($datebeginning));
        While($row = $query->fetch()) {
            for ($x=1; $x<=51; $x++)
            {
                   echo fwrite($csvfile, $row[$x].",");//inside loop;
            }
                   echo fwrite($csvfile, "\r\n");
        }
            fclose ($csvfile);
            echo 'Data Compilation Complete: download now...';
           }

我得到的神秘数字看起来只是数据编译完成(下面)似乎与数据本身无关(它由一个名字,姓氏和一堆-1和1组成(一个真假) )...

117342222333222233223232233332232232332223323233333332117672223232323222233322222233233232323233323233322222数据编译完成:立即下载...

想法有人???