How to validate form data in Phalcon?

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$validation = new PhalconValidation();

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$email = new PhalconValidationValidatorEmail([
    'message' => 'Please enter a valid email address'
]);

$validation->add('email', $email);

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$validation->add('password', new PhalconValidationValidatorPresenceOf([
    'message' => 'The password is required'
]));

$validation->add('password', new PhalconValidationValidatorStringLength([
    'min' => 8,
    'messageMinimum' => 'The password must be at least 8 characters long'
]));

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$data = $this->request->getPost();
$messages = $validation->validate($data);

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if (count($messages) > 0) {
    foreach ($messages as $message) {
        echo $message, '';
    }
} else {
    // Form data is valid, process it here
}