php_laravel_laracasts/app/Listeners/QueryExecutedListener.php

<?php

namespace App\Listeners;

use Illuminate\Database\Events\QueryExecuted;

class QueryExecutedListener
{
    public function handle(QueryExecuted $event)
    {
        // If triggered, will be shown in addition to the controller response.
        // Don't use dd() as it includes a die() so the results are not stored.
        echo $event->sql;
    }
}