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<?php

// found at http://php.net/manual/en/function.array-filter.php

function array_reindex(array $source, $blacklist = array())
{
    $i = 0;
    foreach ($source as $key => $val) {
        if ($key != $i) {
            unset($source[$key]);
            $source[$i] = $val;
        }

        $i++;
    }

    foreach ($source as $key => $val) {
        foreach ($blacklist as $var) {
            if ($val === $var) {
                unset($source[$key]);
                $source = reindex($source, $blacklist);
            }
        }
    }

    return $source;
}

// Examples:

// Create a simple array
$input = array(1 => 'red', 3 => 'green', 5 => 'blue', 7 => TRUE, 9 => FALSE, 11 => NULL);

// NOTE: If you have an array (look above) and your blacklist will look like this: array(TRUE, FALSE, NULL)
//          Filter will delete array keys with value TRUE, FALSE or NULL
$blacklist = array(TRUE, FALSE, NULL);

// Output is: Array ( [0] => red [1] => green [2] => blue )
print_r( reindex($input, $blacklist) );