Get highest value from multidimensional array

Question

Here is my multidimensional array:

$arrOrg = [2, 3, [5, 7, 1], 100, [6, 9, [14, 95]], 78];

I want to get the highest value from this array.

Here is what I have tried so far:

$highest = 0;
function getHighest($arr) {
    for ($i = 0; $i < count($arr); $i++) {
        if (is_array($arr[$i])) {
            getHighest($arr[$i]);
        } else {
            if ($arr[$i] > $arr[$i + 1]) {
                $highest = $arr[$i];
            } else {
                $highest = $arr[$i + 1];
            }
        }
    }
    return $highest;
}
echo getHighest($arrOrg);

But it is giving an incorrect result: 78

Can you help me out?

Answer 1

Maybe something like this:

$arrOrg = [2, 3, [5, 7, 1], 100, [6, 9, [14, 95]], 78];
$json   = json_encode($arrOrg);
$json   = str_replace(array('[', ']'), "", $json);
$arr    = explode(",", $json);

echo $maximum = max($arr);

EDIT after Vahe Galstyan comment

$arrOrg = array(
    2, 
    3,
    array(5, 7, 1), 
    100,
    array(
        6, 
        9, 
        array(14, 95)
    ), 
    78
);

$json = json_encode($arrOrg);
$json = str_replace(array('[', ']'), "", $json);
$arr  = explode(",", $json);

echo $maximum = max($arr);