PHP简单Post-Post参数为空[重复]

我在做一个简单的复习申请。下图是我的数据库架构:

下面是我用来接受post请求的PHP:

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = ($_POST["name"]);
    $title1 = ($_POST["phone"]);
    $title2 = ($_POST["myphone"]);
    // check if name only contains letters and whitespace
    $image = ($_POST["stars"]);
    // check if name only contains letters and whitespace

    mysql_query("insert into `PeerReview` 
                        ( `ReviewerPhoneNumber`, `RevieweePhoneNumber`, 
                          `RevieweeName`, `Comments`, `Stars` ) 
                values ( '".$title2."', '".$title1."', '".$name."', '".$image."', '".$image."')");
    if (mysql_error()) {
        die(mysql_error());

        echo '
             <div class="post" style="border-bottom:1px black solid;">
              <h3>Thank You!</h3>
              </div>
              </body>
              </html>';
        die();
    }
}

我正在使用邮递员发送邮寄请求: