寻找构造多维、多层、关联数组的方法

$array = [
    'key1' => [
        'key2' => [
            'key3' => 'value'
        ]
    ]
];

$obj = new stdClass();
$obj->key1 = new stdClass();
$obj->key1->key2 = new stdClass();
$obj->key1->key2->key3 = 'value';

function buildArray($keys, $value) {
    if (count($keys) === 1) {
        return [$keys[0] => $value];
    }
    
    $key = array_shift($keys);
    return [$key => buildArray($keys, $value)];
}

$array = buildArray(['key1', 'key2', 'key3'], 'value');