如何将custIC作为update.php的会话ID发送

Question

员工将输入empID并为其设置会话。当他们进入页面时，会有一个客户列表。当他们点击更新时，它将重定向到更新页面，同时根据custIC创建会话ID。问题是为什么它发送数组中的最后一个custIC而不是我选择的那个？顺便说一句，我使用xampp连接我的数据库。

<?php
session_start();
require "lowkosDB.php";
?>


<?php
        $empID      = $_POST['empID'];
        $password   = $_POST['password'];

        $selectsql  = "SELECT *
                        FROM employee
                         WHERE empID = '$empID'
                          AND   password = '$password';";
        $result     = mysql_query($selectsql);
        $numRows    = mysql_num_rows($result);
        $row        = mysql_fetch_array($result);
        $id         = $row['empID'];
        $selectsql2 = "SELECT * from customer C, employee E, item I, reference R, service S
                        WHERE R.custIC  = C.custIC
                         AND R.itemNo   = I.itemNo
                          AND R.servNo  = S.servNo
                           AND R.empID      = E.empID
                            ORDER BY refNo;";
        $result2    = mysql_query($selectsql2);
        $numRows2   = mysql_num_rows($result2);
        $row2       = mysql_fetch_array($result2);

        if($numRows > 0) {
            print "Welcome back, $row[empName]<br>";
            print "What to do next?<br>";
            print "<a href=update.php?empID=$id>Update</a><br>";
            print "<a href=delete.php?empID=$id>Delete</a><br>";

            $_SESSION['empID'] = $id;
            print "Your session id is ".$_SESSION['empID'];

            print "<table border=1 ><tr align=center><th>Reference No</th>";
            print "<th>Customer IC</th>";
            print "<th>Customer Name</th>";
            print "<th>Item No</th>";
            print "<th>Service No</th>";
            print "<th>Technician ID</th>";
            print "<th>Progress</th></tr>"; 
            $c      = 0;
            while($row2 = mysql_fetch_assoc($result2))  {
                echo "<tr align=center><td>$row2[refNo]</td>";
                echo "<td>$row2[custIC]</td>";
                echo "<td>$row2[custName]</td>";
                echo "<td>$row2[itemNo]</td>";
                echo "<td>$row2[servNo]</td>";
                echo "<td>$row2[empName]</td>";
                echo "<td>$row2[progress]</td>";
                $cust[$c]   = $row2['custIC'];
                echo "<td><a href=update.php?custIC[$c]=$cust[$c]>UPDATE</a></td></tr>";
                $c = $c + 1;
                echo "$c";  }

            print "</table>";
            print "<br/>Register a new customer? Click <a href=insert.php>HERE</a>";    
            for($i=0;$i<$c;$i++) {
                echo $cust[$i];
            }}

        else
            print "Login unsuccessful. Please <a href=login.php>Re-Login</a>";
        ?>