Remove NULL, FALSE, and '' - but not 0 - from a PHP array

Question

I want to remove NULL, FALSE and \'\' values .

I used array_filter but it removes the 0\' s also.

Answer 1

function my_filter($var)
{
    // returns values that are neither false nor null (but can be 0)
    return ($var !== false && $var !== null && $var !== '');
}

$entry = array(
             0 => 'foo',
             1 => false,
             2 => -1,
             3 => null,
             4 => '',
             5 => 0
          );

print_r(array_filter($entry, 'my_filter'));

Outputs:

Array
(
    [0] => foo
    [2] => -1
    [5] => 0
)