PHP - 通过查询字符串传递下拉列表选项

Question

I have a drop down list that has options that need to be passed through a query string. How would I go about doing this? Also, would anyone be able to list a way to do this both using a button and without using a button? Thank you!

Answer 1

<form method="get">
<select multiple="multiple" name="things[]">
...
</select>
<input type="submit" value="submit"/>
</form>

<?php    
if(isset($_GET['things'])) {
    foreach($_GET['things'] as $thing) {
       echo $thing . '<br />';
    }
}
?>