$result_set = Array
(
    [0] => Array
        (
            [home_id] => 1
            [address] => 4225 Nasmyth Dr
            [city] => Plano
            [state] => TX
            [zip] => 76798
        )

    [1] => Array
        (
            [home_id] => 8
            [address] => 4229 Nasmyth Dr
            [city] => Plano
            [state] => TX
            [zip] => 75093
        )
);

// this doesn't work since $result_set is an array of arrays and htmlspecialchars is expecting a string
htmlspecialchars($result_set, ENT_QUOTES, 'UTF-8'));

array_walk_recursive($result_set, "htmlspecialchars", array(ENT_QUOTES,'UTF-8'))

function cleanOutput(&$value) {
    return htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
}
print_r($result_set);
print('-------');
print_r(array_walk_recursive($result_set, "cleanOutput"));

Array
(
    [0] => Array
        (
            [home_id] => 1
            [address] => 4225 Nasmyth Dr
            [city] => Plano
            [state] => TX
            [zip] => 76798
        )
    [1] => Array
        (
            [home_id] => 8
            [address] => 4229 Nasmyth Dr
            [city] => Plano
            [state] => TX
            [zip] => 75093
        )
)
-------1

function cleanOutput(&$value) {
    return htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
}
$result_set = Array
    (
        [0] => Array
            (
                [home_id] => 1
                [address] => 4225 Nasmyth Dr
                [city] => Plano
                [state] => TX
                [zip] => 76798
            )

        [1] => Array
            (
                [home_id] => 8
                [address] => 4229 Nasmyth Dr
                [city] => Plano
                [state] => TX
                [zip] => 75093
            )
    );

$cleanedOutput = array();
foreach ($result_set as $rs) {
    $cleaned[] = array_map("cleanOutput", $rs);
}
print_r($cleanedOutput);

{'homes' : []}

function filter(&$value) {
  $value = htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
}
array_walk_recursive($result_set, "filter");
print_r($result_set);

$cleaned = array_map("htmlspecialchars", $myArray);

function myFunc($a) {
  return htmlspecialchars($a, ENT_QUOES);
}

$cleaned = array_map("myFunc", $myArray);

$cleaned = array();
foreach ($result_set as $rs) {
  foreach ($rs as $r) {
    $cleaned[] = array_map("htmlspecialchars", $r);
  }
}

array_walk_recursive($myArray, "htmlspecialchars");

$clean_array = array_map("htmlspecialchars", $myArray, array(ENT_QUOTES, 'UTF-8'));

$clean_array = array_map("htmlspecialchars", $myArray, array(ENT_QUOTES), array('UTF-8'));

function secure($val) {
    return (is_array($val))?array_map('secure',$val):htmlspecialchars($val, ENT_QUOTES, 'UTF-8');
}

function cleanhtml($dirtyhtml) {
       return htmlspecialchars($dirtyhtml, UTF-8);
  }

  $cleaned = array_map("cleanhtml", $myArray);

function htmlspecialchars_array_modify (&$arr){
        array_walk_recursive($arr,function(&$value){
            $value=htmlspecialchars($value);
        });
        return $arr;
    }