How to get data from a list box

The HTML for a list box that doesn’t allow multiple selections

      <select id="card_type" name="card_type" size="3">
        <option value="visa">Visa</option>
        <option value="mastercard">MasterCard</option>
        <option value="discover">Discover</option>
      </select>

The HTML for a list box that allows multiple selections

      <select id="toping" name="top[]" size="3" multiple>
        <option value="pep">Peperoni</option>
        <option value="msh">Mushrooms</option>
        <option value="olv">Olives</option>
      </select>

The PHP for a list box that allows multiple options to be selected

      <?php
      $toppings = filter_input(INPUT_POST, 'top', 
                               FILTER_SANITIZE_SPECIAL_CHARS, FILTER_REQUIRE_ARRAY);
      foreach($toppings as $key => $value) {
        echo("$key = $value<br />\n");
      }
        echo("</p>\n");
      } else {
        echo("No toppings selected.</p>\n");
      }
      ?>

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