如何使用選擇和提交按鈕重定向

Question

我使用PHP來填充選項列表，然後想要使用提交併將我帶到另一個頁面...如何檢查在下拉列表中選擇了什麼，提交併把我帶到那個頁面？

form action="/test.php" method="post"> 
    <select> 
    <option value hidden>All</option> 
    <?php 

    $connection = mysqli_connect("127.0.0.1","root",""); 
    mysqli_select_db($connection,"test"); 
    $result = mysqli_query($connection,"select description from categories"); 
    while($row = mysqli_fetch_array($result)) 
    { 
    print "<option value = 
    ".$row['description'].".php".">".$row['description']."</option>"; 
    } 

    ?> 
    </select> 
    <button type = "submit" form= "menu" value="Submit">Filter</button>`