how to make checkbox checked in php code example

Example: how to display checked checkbox value in php

<td align="center"><h4>Portrait Packages</h4>
        <!--Please select the package(s) you wish to purchase.--></td>
        
          
          <td>
          	<input type="checkbox" name="package[]" value="bronze"> Bronze - $62.95<br>
            <input type="checkbox" name="package[]" value="silver"> Silver - $65.95<br>
          	<input type="checkbox" name="package[]" value="gold"> Gold - $67.95<br>
            <input type="checkbox" name="package[]" value="platinum"> Platinum - $69.95<br>
            <input type="checkbox" name="package[]" value="unbelievable"> Unbelievable - $83.95<br>
          	<input type="checkbox" name="package[]" value="astonishing"> Astonishing - $86.95<br>

          </td>
        </tr>
         <tr>
        <td align="center"><h4>Additional Prints with Package Purchase</h4>
 </td>
        
          
          <td>
          	<input type="checkbox" name="print[]" value="three_by_five"> Four 3x5's - $16.00<br>
            <input type="checkbox" name="print[]" value="five_by_seven"> Two 5x7's - $16.00<br>
          	<input type="checkbox" name="print[]" value="eight_by_ten"> One 8x10 - $16.00<br>
            <input type="checkbox" name="print[]" value="sixteen_wallets"> 16 Wallets - $16.00<br>
            <input type="checkbox" name="print[]" value="twentyfour_wallets"> 24 Wallets - $30.95<br>
          	<input type="checkbox" name="print[]" value="ten_by_thirteen"> One 10x13 - $21.00<br>

          </td>
        </tr>
        <tr>
        <td align="center"><h4>Additional Prints without Package Purchase</h4>
 </td>
         <td>
          	<input type="checkbox" name="print_nopack[]" value="three_by_five_nopack"> Four 3x5's - $40.95<br>

            <input type="checkbox" name="print_nopack[]" value="five_by_seven_nopack"> Two 5x7's - $44.95<br>
          	<input type="checkbox" name="print_nopack[]" value="eight_by_ten_nopack"> One 8x10 - $46.95<br>
            <input type="checkbox" name="print_nopack[]" value="sixteen_wallets_nopack"> 16 Wallets - $25.95<br>
            <input type="checkbox" name="print_nopack[]" value="twentyfour_wallets_nopack"> 24 Wallets - $30.95<br>
          	<input type="checkbox" name="print_nopack[]" value="ten_by_thirteen_nopack"> One 10x13 - $50.95<br>

          </td>
        </tr>
        <tr>
          <td align="right" valign="top"><label for="message">Special Instructions:</label>  </td>
          <td><textarea name="message" id="message" cols="50" rows="3"></textarea></td>
        </tr>