PHP menggunakan Exception untuk menangani error secara terstruktur.

Try/Catch:

try {
    $result = riskyOperation();
    echo $result;
} catch (Exception $e) {
    echo "Error: " . $e->getMessage();
} finally {
    // Selalu dijalankan (optional)
    cleanup();
}

Throwing exception:

function bagi(int $a, int $b): float {
    if ($b === 0) {
        throw new InvalidArgumentException("Tidak bisa dibagi nol!");
    }
    return $a / $b;
}

try {
    echo bagi(10, 0);
} catch (InvalidArgumentException $e) {
    echo $e->getMessage(); // "Tidak bisa dibagi nol!"
}

Custom exception:

class InsufficientBalanceException extends Exception {
    public function __construct(float $balance, float $amount) {
        parent::__construct(
            "Saldo tidak cukup. Saldo: $balance, Dicoba: $amount"
        );
    }
}

function transfer(float $amount): void {
    $balance = getBalance();
    if ($balance < $amount) {
        throw new InsufficientBalanceException($balance, $amount);
    }
    // ... proses transfer
}