PHP의 다중 선택 HTML 양식에서 다중 선택된 값을 검색하는 방법은 무엇입니까?

<form method="get" action="display.php">
  <select name="select2[]" multiple size="3">
    <option value="11">eleven</option>
    <option value="12">twelve</option>
    <option value="13">thirette</option>
    <option value="14">fourteen</option>
    <option value="15">fifteen</option>
  </select>
  <input type="submit" name="Submit" value="Submit">
</form>

<select name="select2[]" multiple ...>

<?php
header("Content-Type: text/plain");

foreach ($_GET['select2'] as $selectedOption) {
    echo $selectedOption . "\n";
}
?>