How to get data from a checkbox

The HTML for three check boxes

      <input type="checkbox" id="pep" name="pep" checked />Pepperoni<br />
      <input type="checkbox" id="msh" name="msh" checked />Mushrooms<br />
      <input type="checkbox" id="olv" name="olv" checked />Olives<br />

The PHP to access the check box data

      <?php
      $pepperoni = isset($_POST['pep']); 
      $mushrooms = isset($_POST['msh']); 
      $olives = isset($_POST['olv']);
      ?>

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