我在searchroom.php中将值提交给selectroom.php进行处理,总是出现Notice: Undefined index:
searchroom.php
            <form action="/qiantaijiedai/selectroom.php" method="post">
            Room Type:
           <select id="selecttype">
                            <option value="single">single</option>
                            <option value="double">double</option>
                            <option value="triple">triple</option>
                            <option value="multi">multi</option>
            </select>
            </br>
            Room Price:
            <select id="pricerange">
                            <option value="100"><=100</option>
                            <option value="200">100-200</option>
                            <option value="300">200-300</option>
                            <option value="301">>300</option>
            </select>
            </br>
            <input type="submit" value="submit"/>
            </form>
selectroom.php
        <div>
        <?php 
        $roomtype=$_POST["selecttype"];
        $roomprice= $_POST["pricerange"];

        echo $roomtype;红色部分是出错的地方,我想知道为什么得不到$_POST["selecttype"]和$_POST["pricerange"]呢?
        echo $roomprice;
        ?>
        </div>