what is a good method to sanitize the whole $_POST array in php?

Question

I have a form with a lot of variables which is then sending an email, rather than sanitizing each $_POST value with filter_var($_POST[\'var\'], FILTER_SAN

Answer 1

This is what I use in all my projects:

function util_array_trim(array &$array, $filter = false)
{
    array_walk_recursive($array, function (&$value) use ($filter) {
        $value = trim($value);
        if ($filter) {
            $value = filter_var($value, FILTER_SANITIZE_STRING);
        }
    });

    return $array;
}

It allows to trim and sanitize a nested array of posted data