使用Laravel判断其他数据库中是否存在记录

我有两个网站，我想判断一下第二个网站上是否有作者.

$QUOTE始终显示:

In ENV file:个

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=poems
DB_USERNAME=root
DB_PASSWORD=

DB_QUOTES_CONNECTION=quotes
DB_QUOTES_DATABASE=quotes

In config.database.php个

'connections' => [
    'mysql' => [
        'driver' => 'mysql',
        'url' => env('DATABASE_URL'),
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '3306'),
        'database' => env('DB_DATABASE', 'forge'),
        'username' => env('DB_USERNAME', 'forge'),
        'password' => env('DB_PASSWORD', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'prefix_indexes' => true,
        'strict' => true,
        'engine' => null,
        'options' => extension_loaded('pdo_mysql') ? array_filter([
            PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
        ]) : [],
    ],

    'quotes' => [
        'driver' => 'mysql',
        'url' => env('DATABASE_URL'),
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '3306'),
        'database' => env('DB_QUOTES_DATABASE', 'forge'),
        'username' => env('DB_USERNAME', 'forge'),
        'password' => env('DB_PASSWORD', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'prefix_indexes' => true,
        'strict' => true,
        'engine' => null,
        'options' => extension_loaded('pdo_mysql') ? array_filter([
            PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
        ]) : [],
    ],
  ]

在AuthController.php中

    public function show($author)
    {
        $author = Author::where('slug', $author)->firstOrFail();
        $poems = $author->poems()->get();

        $quotes = DB::connection('quotes')->table('frasidautore.authors')->select('slug')->where('slug', 'LIKE', '"%{$author->slug}"')->get();

        $author->quotes = ($quotes) ? 'https://www.example.com/authors/' . $author->slug : NULL;

        return view('author', compact(['author', 'poems'])); 
    }