<?php

use Zend\Config\Config;
use Zend\Debug\Debug;

$array1 = [
    'base' => [
        'env' => 'prod',
        'path' => '//config1',
        'credentials' => [
            'user' => 'johnDoe42',
            'password' => 'hfvggjihdsc63vg',
        ],
        'val1' => 'config1',
    ],
];

$array2 = [
    'base' => [
        'env' => 'dev',
        'path' => '//config2',
        'credentials' => [
            'user' => 'janeDoe42',
            'password' => 'abc123',
        ],
        'val2' => 'config2',
    ],
];

$allowChanges = true;
$config1 = new Config($array1, $allowChanges);
$config2 = new Config($array2);

$config1->merge($config2);

Debug::dump($config1->toArray());

array(1) {

  ["base"] => array(5) {

    ["env"] => string(3) "dev"

    ["path"] => string(9) "//config2"

    ["credentials"] => array(2) {

      ["user"] => string(9) "janeDoe42"

      ["password"] => string(6) "abc123"

    }

    ["val1"] => string(7) "config1"

    ["val2"] => string(7) "config2"

  }

}

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PHP 7.2, Zend 3.0, Symfony 4.0, Laravel 5.6, PHPUnit 6.5, Doctrine 2.8