How can you add validations in Phalcon?

Phalcon uses an independent module “Phalcon\Validation” for validating users requests. This component can be used to implement validation rules on data objects that do not belong to a model or collection.
The loosely-coupled design of this component allows you to create your own validators along with the ones provided by the framework.
The following example shows basic usage of validations in Phalcon :

<?php

use Phalcon\Forms\Element\Text;
use Phalcon\Validation\Validator\PresenceOf;
use Phalcon\Validation\Validator\StringLength;

$name = new Text(
    "name"
);

$name->addValidator(
    new PresenceOf(
        [
            "message" => "The name is required",
        ]
    )
);

$name->addValidator(
    new StringLength(
        [
            "min"            => 10,
            "messageMinimum" => "The name is too short",
        ]
    )
);

$form->add($name);