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class userregistration {    public function register(array $data): void {        // validate all inputs immediately        $this->validateemail($data['email']);        $this->validatepassword($data['password']);        $this->validateage($data['age']);        // only proceed if all validations pass        $this->createuser($data);    }    private function validateemail(string $email): void {        if (!filter_var($email, filter_validate_email)) {            throw new validationexception('invalid email format');        }        if ($this->emailexists($email)) {            throw new duplicateemailexception('email already registered');        }    }}

class appconfig {    private array $config;    public function __construct(string $configpath) {        if (!file_exists($configpath)) {            throw new configurationexception("config file not found: $configpath");        }        $config = parse_ini_file($configpath, true);        if ($config === false) {            throw new configurationexception("invalid config file format");        }        $this->validaterequiredsettings($config);        $this->config = $config;    }    private function validaterequiredsettings(array $config): void {        $required = ['database', 'api_key', 'environment'];        foreach ($required as $key) {            if (!isset($config[$key])) {                throw new configurationexception("missing required config: $key");            }        }    }}

class databaseconnection {    private pdo $connection;    public function __construct(array $config) {        try {            $this->validatedatabaseconfig($config);            $this->connection = new pdo(                $this->builddsn($config),                $config['username'],                $config['password'],                [pdo::attr_errmode => pdo::errmode_exception]            );        } catch (pdoexception $e) {            throw new databaseconnectionexception(                "failed to connect to database: " . $e->getmessage()            );        }    }    private function validatedatabaseconfig(array $config): void {        $required = ['host', 'port', 'database', 'username', 'password'];        foreach ($required as $param) {            if (!isset($config[$param])) {                throw new databaseconfigexception("missing $param in database config");            }        }    }}

class paymentgateway {    public function processpayment(order $order): paymentresult {        // validate api credentials        if (!$this->validateapicredentials()) {            throw new apiconfigurationexception('invalid api credentials');        }        // validate order before external call        if (!$order->isvalid()) {            throw new invalidorderexception('invalid order state');        }        try {            $response = $this->apiclient->charge($order);            if (!$response->issuccessful()) {                throw new paymentfailedexception($response->geterror());            }            return new paymentresult($response);        } catch (apiexception $e) {            throw new paymentprocessingexception(                "payment processing failed: " . $e->getmessage()            );        }    }}

class DataProcessor {    public function processBatch(array $records): array {        $this->validateBatchSize($records);        $results = [];        foreach ($records as $index => $record) {            try {                $this->validateRecord($record);                $results[] = $this->processRecord($record);            } catch (ValidationException $e) {                throw new BatchProcessingException(                    "Failed at record $index: " . $e->getMessage()                );            }        }        return $results;    }    private function validateBatchSize(array $records): void {        if (empty($records)) {            throw new EmptyBatchException('Empty batch provided');        }        if (count($records) > 1000) {            throw new BatchSizeException('Batch size exceeds maximum limit');        }    }}