How to validate an array of strings in symfony?

by edmond_brakus , in category: PHP Frameworks , a month ago

How to validate an array of strings in symfony?

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1 answer

by aniya.jaskolski , a month ago

@edmond_brakus 

In Symfony, you can validate an array of strings using the Symfony Validation Component. You can create a custom form type that accepts an array of strings, and then add validation constraints to ensure that the array contains only valid strings.


Here's an example of how you can validate an array of strings in Symfony:

  1. Define a custom form type for the array of strings:
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// src/Form/Type/StringArrayType.php

namespace AppFormType;

use SymfonyComponentFormAbstractType;
use SymfonyComponentFormExtensionCoreTypeCollectionType;
use SymfonyComponentFormFormBuilderInterface;
use SymfonyComponentOptionsResolverOptionsResolver;

class StringArrayType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('strings', CollectionType::class, [
                'entry_type' => TextType::class,
                'allow_add' => true,
                'allow_delete' => true,
                'constraints' => [
                    new All([
                        new NotBlank(),
                        new Type(['type' => 'string']),
                    ]),
                ],
            ]);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => null,
        ]);
    }
}


  1. Use the custom form type in your form builder:
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// src/Form/ExampleFormType.php

namespace AppForm;

use SymfonyComponentFormFormBuilderInterface;
use SymfonyComponentOptionsResolverOptionsResolver;
use SymfonyComponentFormAbstractType;
use AppFormTypeStringArrayType;

class ExampleFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('strings', StringArrayType::class);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => null,
        ]);
    }
}


  1. Create a form with the ExampleFormType and handle the form submission:
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// src/Controller/ExampleController.php

namespace AppController;

use AppFormExampleFormType;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentRoutingAnnotationRoute;
use SymfonyBundleFrameworkBundleControllerAbstractController;

class ExampleController extends AbstractController
{
    /**
     * @Route("/example", name="example")
     * @param Request $request
     * @return Response
     */
    public function exampleForm(Request $request): Response
    {
        $form = $this->createForm(ExampleFormType::class);
        $form->handleRequest($request);
        
        if ($form->isSubmitted() && $form->isValid()) {
            // Handle form submission
        }

        return $this->render('example/form.html.twig', [
            'form' => $form->createView(),
        ]);
    }
}


This is just a basic example of how you can validate an array of strings in Symfony using the Symfony Validation Component. You can add more complex validation constraints depending on your requirements.