HTML: POST array not showing unchecked checkbox

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<td>   <input type="checkbox" name="cb[]"/>   <input type="checkbox" name="cb[]"/> </td>

• Solution 1) Explicit index + hidden trick

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<td>   <input type="hidden" name="cb[0]" value=""/>   <input type="checkbox" name="cb[0]"/>   <input type="hidden" name="cb[1]" value=""/>   <input type="checkbox" name="cb[1]"/> </td>

• Solution 2) Explicit index + fill in the blanks (e.g. with PHP)

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<td>   <input type="checkbox" name="cb[0]"/>   <input type="checkbox" name="cb[1]"/> </td>

$post_array = $_POST['cb'];
$defaults = array_fill(0, 2, '0');
$post_array = $post_array + $defaults;