Symfony OptionsResolver example of use case

gistfile1.txt

<?php

namespace Demo\FormBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller ;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\HttpKernel\Exception\HttpException;

/**
 * Controller.
 *
 */
class DefaultController extends Controller {

      /**
     * Array of parameters accepted in the request, required parameter or not
     *
     * @var array
     */

    protected $parameters = array(
        'email'     => true,
        'firstName' => false
    );

    /**
     * OptionsResolver example of use case
     *
     */
    public function indexAction() {

        $resolver = new OptionsResolver();
        $allowedValues = array(
            'email' => array("[email protected]", "[email protected]"),
        );
        $allowedTypes = array(
            'firstName' => array("string", null),
        );

        $normalizer = array(
        'firstName' => function ($options,$value) {
            return ucfirst($value);
        }) ;

        $resolver
        ->setOptional(array_keys(array_filter($this->parameters, function ($val) {
        return (false === $val);
        })))
        
        ->setRequired(array_keys(array_filter($this->parameters, function ($val) {
        return (true === $val);
        })))
        
        ->setAllowedValues($allowedValues)
        ->setAllowedTypes($allowedTypes)
        ->setNormalizers( $normalizer );
        
       
        try {
            return $resolver->resolve($this->get('request')->query->all());
        } catch (\Exception $e) {
            throw new HttpException(400, 'Invalid parameters.');
        }
    }
     
    }