<?php

use Symfony\Component\Validator\ValidatorBuilder;
use Symfony\Component\Validator\Constraints as C;
use Symfony\Component\Validator\ConstraintViolationList;
use Doctrine\Common\Annotations\AnnotationRegistry;

$projectRootPath = '/path/to/project';

class Foo
{
    /**
     * @C\NotBlank(payload={"severity"="info"})
     * @C\NotNull(payload={"severity"="error"})
     */
    public $word;
}

// Validator uses Doctrine Annotation library
AnnotationRegistry::registerAutoloadNamespace(
    'Symfony\Component\Validator\Constraints',
    $projectRootPath . '/vendor/symfony/symfony/src'
);

$echoLog = function($violationList) {
    foreach ($violationList as $violation) {
        $constraint = $violation->getConstraint();
        if (isset($constraint->payload['severity']) && 'error' === $constraint->payload['severity']) {
            echo $constraint->message.PHP_EOL;
        }
    }
};

$validator = (new ValidatorBuilder())
    ->enableAnnotationMapping()
    ->getValidator();

$foo = new Foo();

echo '<b>Value is null.</b>'.PHP_EOL;
$violationList = $validator->validate($foo);
$echoLog($violationList);

echo '<b>Value is blank.</b>'.PHP_EOL;
$foo->word = '';

$violationList = $validator->validate($foo);
$echoLog($violationList);

Value is null.
This value should not be null.
Value is blank.

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PHP 8.2, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8