<?php

use Laminas\Config\Config;
use Laminas\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);

dump($config1->toArray());


^ array:1 [

  "base" => array:5 [

    "env" => "dev"

    "path" => "//config2"

    "credentials" => array:2 [

      "user" => "janeDoe42"

      "password" => "abc123"

    ]

    "val1" => "config1"

    "val2" => "config2"

  ]

]

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PHP 8.2, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8