<?php
echo<<<EOT
<form action="" method=get>
 <select name="listVar[]" multiple="multiple" size=3>
  <option>first</option>
  <option>second</option>
  <option>three</option>
  <option>four</option>
  <option>five</option>
 </select>
 <input type=submit value=提交 name=submit>
</form>
EOT;
/*输出GET到的值（数组）*/
if (isset ($_GET["submit"])) {
 foreach($_GET["listVar"] as $value){
  echo $value."<br>";
 }
}
?>