array_walk_recursive working for objects.

recursive_array_walk_recursive.php

<?php

class A
{
    private $ab = 5;
    public  $ac = 6;
}

/**
 * WARNING: This https://bugs.php.net/bug.php?id=45937 seems not yet solved
 * So, with this approach you could be accessing/changing private/protected
 * members of the object.
 */

function walking_objects(&$value) {
    if (is_object($value)) {
        array_walk_recursive($value, "walking_objects");
    } else {
        $value = 20;
    }
};

// $var can be an array or object
$var = array(new A(), 1, "c");
array_walk_recursive($var, "walking_objects");

print_r($var);