PHP 过滤器(多个下拉列表）

我环顾互联网甚至在这里，但由于我缺乏 php 知识，我发现很难让它工作。我觉得我很接近（嗯，我想）。

正在尝试制作一个过滤器页面，人们可以在其中过滤手机品牌，例如包装附带的分钟数（目前，只有两个功能，但一旦我有了这个功能，我计划添加更多）。

提前感谢！

好的，足够详细的 - 这是我的代码

过滤器.php：

    <?php
        include('db.php');  // include your code to connect to DB.
        $tbl_name="mobile";     //your table name
        $sql="SELECT DISTINCT model FROM $tbl_name ORDER BY model ASC"; 
        $result=mysql_query($sql); 
            $sql1="SELECT DISTINCT minutes FROM $tbl_name ORDER BY model ASC"; 
    $result1=mysql_query($sql1); 
    $model_o=""; 
    while ($row=mysql_fetch_array($result)) { 
        $model=$row["model"]; 
        $model_o.="<OPTION VALUE='"$model'">".$model; 
    } 
    $minutes_o=""; 
    while ($row=mysql_fetch_array($result1)) { 
         $minutes=$row["minutes"]; 
        $minutes_o.="<OPTION VALUE='"$minutes'">".$minutes;
    } 
    ?>
    <form action="result.php" method="post">
    <SELECT NAME=Model> 
    <OPTION VALUE=0>Choose 
    <?=$model_o?> 
    </SELECT> 
    <SELECT NAME=Model> 
    <OPTION VALUE=0>Choose 
    <?=$minutes_o?> 
    </SELECT> 
    <input type="submit" value="search phones" />
    </form>

结果.php

<?php
    include('db.php');  // include your code to connect to DB.
    $tbl_name="mobile";     //your table name
$whereClauses = array(); 
if (! empty($_POST['Model'])) $whereClauses[] ="model='".mysql_real_escape_string($_POST['Model'])."'"; 
if (! empty($_POST['minutes'])) $whereClauses[] ="minutes='".mysql_real_escape_string($_POST['minutes'])."'"; 
$where = ''; 
if (count($whereClauses) > 0) { $where = ' WHERE '.implode(' AND ',$whereClauses); } 
$sql = mysql_query("SELECT * FROM $tbl_name".$where); 
        while($row = mysql_fetch_array( $sql )) 
        {
            echo "<tr>
                  <td><img src='".$row['image_url']."' alt='some_text'/></br>".$row['model']."</td>
                  <td>".$row['tariff']."</td>
                  <td>".$row['minimumcontractterm']."</td>
                  <td>".$row['minutes']."</td>
                  <td>".$row['texts']."</td>
                  <td>".$row['linerental']."</td>
                  <td>£".$row['dealcost']."</td>
                  <td>".$row['free_gift']."</td>
                  <td><button type='submit' class='green' onClick=parent.location='test/deal.php?id='><span>View</span></button></td>
    </tr>";

        // Your while loop here
        }
?>