<?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\Range(min="1", max="100")
     * @C\Type(type="int")
     */
    public $number;
    
    /**
     * @C\Type(type="string")
     */
    public $word;
}

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

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

// create a valid Foo object
$validFoo = new Foo();
$validFoo->number = 5;
$validFoo->word = 'budgie';

// create an invalid Foo object
$invalidFoo = new Foo();
$invalidFoo->number = '105';
$invalidFoo->word = new ArrayObject();

$violationList = $validator->validate($validFoo);
echo get_violations($violationList);

$violationList = $validator->validate($invalidFoo);
echo get_violations($violationList);

function get_violations(ConstraintViolationList $violations) {
    $out = '<pre>violation count: ' . count($violations) . PHP_EOL;
    foreach($violations as $v) {
        $out .= print_r($v->getMessage(), true) . PHP_EOL;
    }
    $out .= '</pre>';
    
    return $out;
}

violation count: 0

violation count: 3
This value should be between "1" and "100".
This value should be of type int.
This value should be of type string.

• Symfony Validator
• Processing your own Symfony bundle configuration
• Making singular words out of plural with Symfony Inflector

PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8