Import databases infos from mysql in database.php

I would like to get databases informations stored in my database in the database.php.
I tried to get all infos in the database but I always have an error like this :

[2019-04-18 16:13:16] laravel.ERROR: syntax error, unexpected 'return' (T_RETURN) {"exception":"[object] (Symfony\Component\Debug\Exception\FatalThrowableError(code: 0): syntax error, unexpected 'return' (T_RETURN) at /var/www/vhosts/xxxxx.net/httpdocs/config/database.php:22)

I added this on the top of database.php :

use App\Campaign;

$database_infos = Campaign::all();

$campains_db = array();

foreach ($database_infos as $info) {
    if (isset($info->db_name)) {
        $campains_db[$info->keyword] = array(
            'driver' => 'mysql',
            'host' => $info->db_host,
            'database' => $info->db_name,
            'username' => $info->db_user,
            'password' => decrypt($info->db_password),
            'prefix' => $info->db_prefix,
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'strict' => false,
            'engine' => null,
        );
    }
}

And this under :

'connections' => [

    $campains_db,

    'sqlite' => [
        'driver' => 'sqlite',
        'database' => env('DB_DATABASE', database_path('database.sqlite')),
        'prefix' => '',
        'foreign_key_constraints' => env('DB_FOREIGN_KEYS', true),
    ],
];

via Chebli Mohamed