Handle the details of a single name multi value form

Just use a simple multi-choice select:

<?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= submit  name=submit>
</form>
EOT;
/* The output GET To (array) */
if (isset ($_GET["submit"])) {
 foreach($_GET["listVar"] as $value){
  echo $value."<br>";
 }
}
?>