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File name : ArrayToCommaStringType.php
Content :
<?php

/*
 * This file is part of the Kimai time-tracking app.
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace App\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\CallbackTransformer;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormBuilderInterface;

class ArrayToCommaStringType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->addModelTransformer(new CallbackTransformer(
            function ($value) {
                if ($value === null) {
                    return null;
                }

                return $value;
            },
            function ($value) {
                return $value;
            }
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function getParent()
    {
        return TextType::class;
    }
}
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