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New in Symfony 5.1: Validator improvements

In addition to the new AtLeastOneOf, ExpressionLanguageSyntax and Hostname validators, Symfony 5.1 introduced other validator improvements.

Added alpha3 option to Country

Contributed by
Maxime Perrimond
in #35116.

If you set the new alpha3 option to true in the Country constraint, the value is checked as a valid ISO 3166-1 alpha-3 three-letter country code (e.g. ARG = Argentina) instead of the default ISO 3166-1 alpha-2 two-letter country code (e.g. AR = Argentina).

Added alpha3 option to Language

Contributed by
Christian Flothmann
in #35848.

Similar to the previous feature, in the Language constraint we added a new alpha3 option to allow using ISO 639-2 three-letter language codes (swe = Swedish) instead of the default ISO 639-1 two-letter language code (sv = Swedish).

Added divisibleBy option to Count

Contributed by
Thomas Calvet
in #35783.

The new divisibleBy option added to the Count constraint checks that the the number of elements of the given collection is divisible by a certain number. If you need to perform this check in other values that aren't collections, use the DivisibleBy constraint.

Validation callables

Contributed by
in #31466.

Sometimes you need to reuse Symfony's constraints in places like the Symfony Console, to validate the answer to a console question. That's why we've added a new Validation::createCallable() to create a callable based on the given constraints:

use Symfony\Component\Console\Style\SymfonyStyle;
use Symfony\Component\Validator\Constraints\NotNull;
use Symfony\Component\Validator\Validation;

$io = new SymfonyStyle($input, $output);
$validation = Validation::createCallable(new NotBlank());

$wsdl = $io->ask('Wsdl location URL', null, $validation);

The argument of createCallable() is variadic, so you can pass any number of constraints:

// ...
use Symfony\Component\Validator\Constraints\Length;
use Symfony\Component\Validator\Constraints\Url;

$validation = Validation::createCallable(new Length(['max' => 255]), new Url());
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awesome news, keep up good work with improving symfony guys!
Or when using an array:

$constraints = [ new Length(['max' => 255]), new Url() ];
$validation = Validation::createCallable(...$constraints);

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