PHP code example of dcp / validator

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

dcp / validator example snippets

use DCP\Form\Validation\Validator;

$validator = new Validator();

use DCP\Form\Validation\Validator;
use DCP\Form\Validation\RuleSet;
use DCP\Form\Validation\Rule;
use DCP\Form\Validation\Constraint;

$ruleSet = (new RuleSet())
    ->add(
        (new Rule())
            ->setFieldName('username')
            ->setMessage('Username cannot be blank')
            ->addConstraint(Constraint::notBlank())
    )
;

$validator = new Validator();
$validator->setRuleSet($ruleSet);

use DCP\Form\Validation\Validator;
use DCP\Form\Validation\Rule;
use DCP\Form\Validation\Constraint;

$validator = new Validator();
$validator->addRule(
    (new Rule())
        ->setFieldName('username')
        ->setMessage('Username cannot be blank')
        ->addConstraint(Constraint::notBlank())
);

use DCP\Form\Validation\Validator;
use DCP\Form\Validation\Rule;
use DCP\Form\Validation\Constraint;

$validator = new Validator();
$validator->addRule(
    (new Rule())
        ->setFieldName('username')
        ->setMessage('Username cannot be blank')
        ->addConstraint(Constraint::notBlank())
);

$form = [
    'username' => 'test_user'
];

$result = $validator->validate($form);

if ($result->isValid()) {
    echo 'Hooray, the form is valid!';
}

use DCP\Form\Validation\Validator;
use DCP\Form\Validation\Rule;
use DCP\Form\Validation\Constraint;

class MyForm
{
    protected $username;

    public function getUsername()
    {
        return $this->username;
    }

    public function setUsername($username)
    {
        $this->username = $username;
    }
}

$validator = new Validator();
$validator->addRule(
    (new Rule())
        ->setFieldName('username')
        ->setMessage('Username cannot be blank')
        ->addConstraint(Constraint::notBlank())
);

$form = new MyForm();
$form->setUsername('test_user');

$result = $validator->validate($form);

if ($result->isValid()) {
    echo 'Hooray, the form is valid!';
}

(new Rule())
    ->setFieldName('username')
    ->setMessage('Username must not be blank')
    ->addConstraint(Constraints::notBlank())
;

(new Rule())->getMessage();
// This field failed validation

(new Rule())
    ->setFieldName('password_repeat')
    ->setMessage('Passwords must match')
    ->addPrerequisite(Prerequisites::notBlank(new FieldReference('password')))
    ->addFilter(Filters::trim())
    ->addConstraint(Constraints::notBlank())
;

$ruleSet = (new RuleSet())
    ->add(
        (new Rule())
            ->setFieldName('username')
            ->setMessage('Username cannot be blank')
            ->addConstraint(Constraint::notBlank())
    )
;

$validator = new Validator();
$validator->setRuleSet($ruleSet);

$validator = new Validator();
$validator->addRule(
    (new Rule())
        ->setFieldName('username')
        ->setMessage('Username cannot be blank')
        ->addConstraint(Constraint::notBlank())
);

(new Rule())
    ->setFieldName('email_address')
    ->addConstraint(Constraints::notBlank())
    ->addConstraint(Constraints::formatEmail())
;
// This will ensure that the email address is not blank, and matches a valid email format (e.g. user@example.com)

(new Rule())
    ->setFieldName('username')
    ->addFilter(Filters::trim())
    ->addFilter(Filters::toLowerCase())
;
// This will trim and lowercase the username field prior to validating the rule.

/*
 * Assume the form has a field named 'send_me_an_email_newsletter' that is a checkbox with a value
 * of 'yes'. When checked, the user is        ->addPrerequisite(Prerequisites::mustMatch(new FieldReference('send_me_an_email_newsletter'), 'yes'))
            ->addFilter(Filters::trim())
            ->addConstraint(Constraints::notBlank())
            ->addConstraint(Constraints::formatEmail())
    )
;

(new RuleSet())
    ->add(
        (new Rule())
            ->setFieldName('password')
            ->setMessage('Password must not be blank')
            ->addFilter(Filters::trim())
            ->addConstraint(Constraints::notBlank())
    )
    ->add(
        (new Rule())
            ->setFieldName('password_repeat')
            ->setMessage('Passwords do not match')
            // Do not validate unless the password field is not blank.
            ->addPrerequisite(Prerequisites::notBlank(new FieldReference('password')))
            ->addFilter(Filters::trim())
            // This field must match the password field's value.
            ->addConstraint(Constraints::mustMatch(new FieldReference('password')))
    )
;

$result = $validator->validate($form);

if ($result->isValid()) {
    echo 'Hooray, the form is valid!';
} else {
    echo 'Better luck next time.';
}

$result = $validator->validate($form);

if (!$result->isValid()) {
    if ($result->fieldHasError('username')) {
        echo 'Username field had a validation error.';
    }
}

$result = $validator->validate($form);

if (!$result->isValid()) {
    if ($result->fieldHasError('username')) {
        echo "Username had a validation error. Wonder what it was:\n";
        echo $result->getError('username');
    }
}

// From the Constraints class
public static function notBlank()
{
    return function ($data) {
        return strlen($data) > 0;
    };
}

$steveCallback = function ($data) {
    if ($data === 'steve') {
        return true;
    }

    return false;
};

(new Rule())
    ->setFieldName('username')
    ->setMessage('You are definitely not steve')
    ->addConstraint($steveCallback)
;

class MyConstraints extends Constraints
{
    public static function isSteve()
    {
        return function ($data) {
            if ($data === 'steve') {
                return true;
            }

            return false;
        };
    }
}

(new Rule())
    ->setFieldName('username')
    ->setMessage('You are definitely not steve')
    ->addConstraint(MyConstraints::isSteve())
;

(new Rule())
    ->setFieldName('username')
    ->setMessage('Please enter a username')
    ->addConstraint(Constraints::notBlank())
    ->addValidationGroup('page_1')
;

$rules = (new RuleSet())
    ->add(
        (new Rule())
            ->setFieldName('username')
            ->setMessage('Please enter a username')
            ->addConstraint(Constraints::notBlank())
            ->addValidationGroup('page_1')
    )
    ->add(
        (new Rule())
            ->setFieldName('password')
            ->setMessage('Please enter a password')
            ->addConstraint(Constraints::notBlank())
            ->addValidationGroup('page_2')
    )
;

$form = [
    'username' => '',
    'password' => ''
];

$validator = new Validator();
$validator->setRuleSet($rules);

$validator->validate('page_2');
// This will only validate the password field.