Inspekt\Cage::keyExistsRecursive PHP Method

    protected function keyExistsRecursive($keys, $data_array)
    {
        $thiskey = current($keys);
        if (is_numeric($thiskey)) {
            // force numeric strings to be integers
            $thiskey = (int) $thiskey;
        }
        if (array_key_exists($thiskey, $data_array)) {
            if (sizeof($keys) == 1) {
                return true;
            } elseif ($data_array[$thiskey] instanceof \ArrayObject) {
                unset($keys[key($keys)]);
                return $this->keyExistsRecursive($keys, $data_array[$thiskey]);
            }
        }
        return false;
    }