使用PHP＆amp;搜索功能MySQL的

Question

如果我输入一个值，系统将正常运行。问题是，当我输入多个值时，系统不显示任何输出。我需要用户可以批量输入数据并用空格分隔。我的代码有问题吗？

$studid = clean($_POST['studid']);
$studid2 = $studid; 
$studid3 =explode(' ',$studid2);
require("php/conn.php");

$sql=mysql_query("SELECT id,studid,name from student where studid in('". implode(',', $studid3)."') group by studid,name");

echo"
<table>
<thead><tr><th>NAME</th><th>IC NUMBER</th><th>ADDRESS</th><th>PHONE NUMBER</th><th>SOURCE</th></tr></thead><tbody>";

if(mysql_num_rows($q) > 0) 
{

   while($row=mysql_fetch_array($q))
   { 
    echo"
    <tr>
    <td>".$row['nama']."</td>
    <td>".$row['nokp']."</td>
    <td>".$row['alamat2']."</td>
    <td>".$row['notel2']."</td>
    <td>".$row['info']."</td>
    </tr>";
   }

   echo "</tbody></table></div>"; 
}  

Answer 1

$studid4 = "'" . implode("','", $studid3) . "'";