How to get data from a drop-down list

The HTML for a drop-down list

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

The HTML to set a default option

      <option value="visa" selected>Visa</option>

The PHP to access the drop-down list data

      <?php
      $card_type = filter_input(INPUT_POST, 'card_type');
      ?>

A drop-down list lets the user select one option from a group of options.
If the selected attribute isn’t coded, the first option in the drop-down list is selected by default.

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