Collection keyByRecursive macro

keyByRecursive.php

<?php

Illuminate\Support\Collection::macro('keyByRecursive', function ($func) {
  
    return $this->keyBy(function ($value, $key) use ($func) {
      
        return $func($value, $key);      
      
    })->map(function ($item) use ($func) {
      
        if ($item instanceof Illuminate\Support\Collection) {     
          
            return $item->keyByRecursive($func);         
        }

        if (is_array($item) || is_object($item)) {
          
            return collect($item)->keyByRecursive($func);
        }

        return $item;
    });
});

keyByRecursiveTest.php

<?php

$collection = collect([
    [
        'key_one' => [
            'sub_key_one' => collect([
                'sub_sub_key_one' => 'final value one',
                'sub_sub_key_two' => 2,
                'sub_sub_key_three' => 3.0,
            ]),
            'sub_key_two' => (object) [
                'sub_sub_key_one' => 'final value one',
                'sub_sub_key_two' => 2,
                'sub_sub_key_three' => 3.0,
            ],
            'sub_key_three' => [
                'sub_sub_key_one' => 'final value one',
                'sub_sub_key_two' => 2,
                'sub_sub_key_three' => 3.0,
            ],
        ],
    ],
]);

$result1 = $collection->keyByRecursive(function ($value, $key) {
    return camel_case($key);
})->toArray();

array_walk_recursive($result1, function ($item, $key) {
    $this->assertTrue(camel_case($key) === $key);
});