function sendSms(string $phoneNumber, string $message): void

final class PhoneNumber
{
    public function __construct(private string $number)
    {
        if (!preg_match('/^\+7\d{10}$/', $number)) {
            throw new InvalidArgumentException('Invalid phone number');
        }
    }

    public function value(): string
    {
        return $this->number;
    }
}

function sendSms(PhoneNumber $phoneNumber, Message $message): void

class UserCollection
{
    /** @var User[] */
    private array $users = [];

    public function __construct(array $users = [])
    {
        foreach ($users as $user) {
            $this->add($user);
        }
    }

    public function add(User $user): void
    {
        $this->users[] = $user;
    }

    public function all(): array
    {
        return $this->users;
    }

    public function filterByActive(): self
    {
        return new self(array_filter($this->users, fn(User $u) => $u->isActive()));
    }

    // и так далее
}

up:
 @cp .env.example .env || true
 @php artisan key:generate
 @composer install
 @npm install
 @php artisan migrate
 @php artisan db:seed
 @npm run dev
 @php artisan serve

use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

public function boot()
{
    DB::listen(function ($query) {
        if (app()->bound('exception.logged')) {
            Log::channel('sql')->debug($query->sql, $query->bindings);
        }
    });

    app()->singleton('exception.logged', function () {
        return true;
    });

    app()->error(function (\Throwable $e) {
        app()->instance('exception.logged', true);
    });
}

ray($user);
ray($order)->blue();
ray()->showQueries();

composer require spatie/laravel-ray --dev

// config/logging.php
'channels' => [
    'payment' => [
        'driver' => 'single',
        'path' => storage_path('logs/payment.log'),
        'level' => 'info',
    ],
],

Log::channel('payment')->info('Платёж прошёл', ['user_id' => $user->id, 'amount' => $amount]);

if (!function_exists('payment_log')) {
    function payment_log($message, array $context = []) {
        \Log::channel('payment')->info($message, $context);
    }
}

     ob_start();
     session_start();
     

   <?php
   // Никакого вывода до этого места!
   session_start();

   // Весь остальной код
   ?>
   

  if (headers_sent($file, $line)) {
      echo "Вывод уже начат в $file на строке $line";
  }
  

$users = [
    ['id' => 1, 'name' => 'Иван', 'email' => 'ivan@example.com'],
    ['id' => 2, 'name' => 'Ольга', 'email' => 'olga@example.com'],
    ['id' => 3, 'name' => 'Павел', 'email' => 'pavel@example.com'],
];

$emails = array_column($users, 'email');

[
    'ivan@example.com',
    'olga@example.com',
    'pavel@example.com'
]

$emailsById = array_column($users, 'email', 'id');

[
    1 => 'ivan@example.com',
    2 => 'olga@example.com',
    3 => 'pavel@example.com'
]