PHP - using a recursive function to find the max() of nested arrays

Question

The following code uses a simple strategy for finding the max of the nested array. It uses foreach to find and label the max value, however, if I got an array that was nested t

Answer 1

You can use array_walk_recursive() for it:

function array_max_recursive($arr)
{
    $max = -INF;

    array_walk_recursive($arr, function($item) use (&$max) {
        if ($item > $max) {
            $max = $item;
        }
    });

    return $max;
}

echo array_max_recursive(["1", "2", ["3", "4"]]); // 4