patrones/app/Console/Commands/Singleton.php

<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use App\Patrones\Singleton\Logger;

class Singleton extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'singleton';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Prueba del patron de diseño singleton';

    /**
     * Execute the console command.
     *
     * @return int
     */
    public function handle()
    {

        $this->info('Comando que permitira hacer pruebas del patron de diseño Singleton');
        Logger::log("Started!");
        // Compare values of Logger singleton.
        $l1 = Logger::getInstance();
        //$this->line(unserialize(serialize($l1)));
        $l2 = Logger::getInstance();
        if ($l1 === $l2) {
            Logger::log("Logger has a single instance.");
        } else {
            Logger::log("Loggers are different.");
        }
        Logger::log("Finished!");
        return Command::SUCCESS;
    }
}