if ($show_profile_form)
{
echo <<<_END

<!-- CLIENT-SIDE VALIDATION -->

<!-- Changing the input types to the appropriate type and adding sensible character restrictions -->

<form action="set_profile.php" method="post">
  Update your profile info:<br>
  First name: <input type="text" maxlength = "40" name="firstname" value="$firstname"required>
  <br>
  Last name: <input type="text" maxlength = "40" name="lastname" value="$lastname"required>
  <br>
  Number of pets: <input type="number" min="0" max="128" name="pets" value="$pets"required>
  <br>
  Email address: <input type="email" maxlength ="50" name="email" value="$email"required>
  <br>
  Date of birth: <input type="date" name="dob" value="$dob"required>
  <br>
  <input type="submit" value="Submit">
</form>
_END;
}