Naqsh nima va qachon kerak

final class ToolovBoshqaruvchi
{
    public function tola(string $usul, int $summa): string
    {
        if ($usul === 'karta') {
            return "Kartadan {$summa} so'm yechildi";
        }
        return "Noma'lum usul";
    }
}

$b = new ToolovBoshqaruvchi();
echo $b->tola('karta', 50000), PHP_EOL;
echo $b->tola('payme', 50000), PHP_EOL;

final class OsganBoshqaruvchi
{
    public function tola(string $usul, int $summa): string
    {
        if ($usul === 'karta') {
            return "Kartadan {$summa} so'm yechildi";
        } elseif ($usul === 'payme') {
            return "Payme orqali {$summa} so'm";
        } elseif ($usul === 'click') {
            return "Click orqali {$summa} so'm";
        } elseif ($usul === 'naqd') {
            return "Naqd {$summa} so'm qabul qilindi";
        } elseif ($usul === 'bolib') {
            $oylik = intdiv($summa, 6);
            return "6 oyga bo'lindi: oyiga {$oylik} so'm";
        }
        return "Noma'lum usul";
    }
}

$b = new OsganBoshqaruvchi();
foreach (['karta', 'click', 'bolib'] as $usul) {
    echo $b->tola($usul, 60000), PHP_EOL;
}

interface ToolovUsuli
{
    public function tola(int $summa): string;
}

final class Karta implements ToolovUsuli
{
    public function tola(int $summa): string
    {
        return "Kartadan {$summa} so'm yechildi";
    }
}

final class Click implements ToolovUsuli
{
    public function tola(int $summa): string
    {
        return "Click orqali {$summa} so'm";
    }
}

final class BolibTolash implements ToolovUsuli
{
    public function __construct(private int $oylar) {}

    public function tola(int $summa): string
    {
        $oylik = intdiv($summa, $this->oylar);
        return "{$this->oylar} oyga bo'lindi: oyiga {$oylik} so'm";
    }
}

function toladi(ToolovUsuli $usul, int $summa): string
{
    return $usul->tola($summa);
}

echo toladi(new Karta(), 60000), PHP_EOL;
echo toladi(new Click(), 60000), PHP_EOL;
echo toladi(new BolibTolash(6), 60000), PHP_EOL;

final class Naqd implements ToolovUsuli
{
    public function tola(int $summa): string
    {
        return "Naqd {$summa} so'm qabul qilindi";
    }
}

// mavjud kod umuman o'zgarmadi
echo toladi(new Naqd(), 60000), PHP_EOL;
echo "yangi sinf qo'shildi, eski kod tegilmadi", PHP_EOL;

// Muammo: ikkita son qo'shish kerak
function qoshish(int $a, int $b): int
{
    return $a + $b;
}

echo qoshish(2, 3), PHP_EOL;

$guruhlar = [
    'Yaratuvchi' => ['Factory Method', 'Abstract Factory', 'Builder',
                     'Singleton', 'Prototype'],
    'Strukturaviy' => ['Adapter', 'Decorator', 'Facade', 'Composite', 'Proxy'],
    'Xulq-atvor' => ['Strategy', 'Observer', 'Command', 'Template Method',
                     'State', 'Chain of Responsibility'],
];

foreach ($guruhlar as $nom => $naqshlar) {
    printf("%-14s %d ta: %s%s", $nom, count($naqshlar),
        implode(', ', array_slice($naqshlar, 0, 3)) . '...', PHP_EOL);
}
echo "jami: ", array_sum(array_map('count', $guruhlar)), PHP_EOL;

$sonlar = [1, 2, 3, 4, 5];

// Strategiya funksiya sifatida uzatiladi
$juftlar = array_filter($sonlar, fn(int $n): bool => $n % 2 === 0);
$kvadratlar = array_map(fn(int $n): int => $n ** 2, $sonlar);

echo 'juftlar: ', implode(', ', $juftlar), PHP_EOL;
echo 'kvadratlar: ', implode(', ', $kvadratlar), PHP_EOL;