PHP form 55: input text textarea checkbox-multiple

    <form method="post" action="process.php" >

        Firstname: <input type="text" name="firstname" />
        <br />

        Lastname: <input type="text" name="lastname" />
        <br />

        Description: <textarea name="description" rows="10" cols="50"></textarea>
        <br />

        Hobbies (multiple):
        <input type="checkbox" name="hobbies[]" value="studying" /> Studying
        <input type="checkbox" name="hobbies[]" value="reading" checked /> Reading
        <input type="checkbox" name="hobbies[]" value="writing" /> Writing
        <input type="checkbox" name="hobbies[]" value="sleeping" checked /> Sleeping

        <br />

        <hr />

        <input type="submit" name="submit" value="Submit" />

    </form>

    echo "<pre>";

    var_dump($_POST);