base64_encode_recursively.php

<?php
function base64_encode_recursively($target) {
    if (is_array($target)) {
        foreach ($target as $key => $value) {
            $target[$key] = base64_encode_recursively($value);
        }
        return $target;
    } else if (is_object($target)) {
        $property_list = get_object_vars($target);
        foreach ($property_list as $key => $value) {
            $target->{$key} = base64_encode_recursively($value);
        }

        return $target;
    } else if (is_null($target)) {
        return null;
    } else if (is_string($target)) {
        switch (mb_detect_encoding($target)) {
            case 'ASCII': case 'UTF-8':
                return $target;
            default:
                return base64_encode($target);
        }
    } else {
        return $target;
    }
}