我的代码无法从mysql数据库中读取

Question

我试图调试这次没有成功。到目前为止，这是我尝试过的<?php$cid= (string)$_GET['cid'];//I passed this from another page using get methodecho $cid; //My code works up to this point$record = mysql_query("select * from questions where QType = '$cid'");$array = array();while($row = mysql_fetch_assoc($record))        {            $array[] = $row;        }    for($var = 0; $var<count($array);$var++)        {        echo $array[$var]['Question'].'<br>';        }                       ?>