File "InteractsWithBroadcasting.php"
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<?php
namespace Illuminate\Broadcasting;
use Illuminate\Support\Arr;
trait InteractsWithBroadcasting
{
    /**
     * The broadcaster connection to use to broadcast the event.
     *
     * @var array
     */
    protected $broadcastConnection = [null];
    /**
     * Broadcast the event using a specific broadcaster.
     *
     * @param  array|string|null  $connection
     * @return $this
     */
    public function broadcastVia($connection = null)
    {
        $this->broadcastConnection = is_null($connection)
                        ? [null]
                        : Arr::wrap($connection);
        return $this;
    }
    /**
     * Get the broadcaster connections the event should be broadcast on.
     *
     * @return array
     */
    public function broadcastConnections()
    {
        return $this->broadcastConnection;
    }
}