从php中的标签中选择选项以使用if[英]Get selected option from the tag in php to use on if

I tried this code:

我试过这段代码:

<select name="selectedOption">
    <option value="select">  Select  </option>
    <option value="option1">  option 1  </option>
    <option value="option2">  option 2  </option>
</select>
<?php $selectedOption = $_POST['selectedOption']; ?>
<?php if($selectedOption == "option1") : ?>
    <a href="/go.html?url=#">This will only display if option 1 selected</a>
<?php elseif($selectedOption == "option2") : ?>
    <a href="/go.html?url=#">This will only display if option 2 selected</a>
<?php endif; ?>
<select name="s