Store arrays of strings into comma-separated values with Doctrine2

CSVType.php

<?php

namespace Doctrine\DBAL\Types;

use Doctrine\DBAL\Platforms\AbstractPlatform;

class CSVType extends StringType
{
    const NAME = 'csv';
    const DELIMITER = ',';

    public function convertToDatabaseValue($value, AbstractPlatform $platform)
    {
        if (!is_array($value)) {
            return $value;
        }

        return implode(self::DELIMITER, $value);
    }

    public function convertToPHPValue($value, AbstractPlatform $platform)
    {
        if ($value === null) {
            return null;
        }

        return explode(self::DELIMITER, $value);
    }

    public function getName()
    {
        return self::NAME;
    }
}