Deep Array Manipulation with Laravel's replaceRecursive Method

Laravel's replaceRecursive method is a powerful tool for modifying nested arrays while leaving untouched elements unchanged. This is especially beneficial when dealing with intricate configuration structures.

Consider this example using Laravel Collections:

$config = collect([
    'user' => [
        'name' => 'John',
        'settings' => [
            'theme' => 'dark',
            'notifications' => true,
        ]
    ]
]);

$updatedConfig = $config->replaceRecursive([
    'user' => [
        'settings' => [
            'theme' => 'light'
        ]
    ]
]);

Here's a practical application within a configurable dashboard system:

<?php

namespace App\Services;

use Illuminate\Support\Collection;

class DashboardConfigurationService
{
    public function mergeUserPreferences(array $defaultConfig, array $userPreferences): array
    {
        return collect($defaultConfig)->replaceRecursive($userPreferences)->all();
    }

    public function getConfiguration(\App\Models\User $user): array
    {
        $defaultConfig = [
            'layout' => [
                'sidebar' => [
                    'position' => 'left',
                    'width' => 250,
                    'collapsed' => false
                ],
                'theme' => [
                    'mode' => 'light',
                    'color' => 'blue',
                    'font_size' => 14
                ],
                'widgets' => [
                    'weather' => true,
                    'calendar' => true,
                    'notifications' => true
                ]
            ]
        ];

        return $this->mergeUserPreferences(
            $defaultConfig,
            $user->dashboard_preferences ?? []
        );
    }
}

replaceRecursive elegantly handles deep array merges, preserving values not explicitly overridden. This makes it ideal for managing configuration updates and user preference systems.

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