Multiselect.php

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<?php
namespace Magento\Eav\Model\Attribute\Data;

use Magento\Framework\App\RequestInterface;

class Multiselect extends \Magento\Eav\Model\Attribute\Data\Select
{
    public function extractValue(RequestInterface $request)
    {
        $values = $this->_getRequestValue($request);
        if ($values !== false && !is_array($values)) {
            $values = [$values];
        }
        return $values;
    }

    public function compactValue($value)
    {
        if (is_array($value)) {
            $value = implode(',', $value);
        }
        return parent::compactValue($value);
    }

    public function outputValue($format = \Magento\Eav\Model\AttributeDataFactory::OUTPUT_FORMAT_TEXT)
    {
        $values = $this->getEntity()->getData($this->getAttribute()->getAttributeCode());
        if (!is_array($values)) {
            $values = explode(',', $values);
        }

        switch ($format) {
            case \Magento\Eav\Model\AttributeDataFactory::OUTPUT_FORMAT_JSON:
            case \Magento\Eav\Model\AttributeDataFactory::OUTPUT_FORMAT_ARRAY:
                $output = $values;
                // fall-through intentional
            default:
                $output = [];
                foreach ($values as $value) {
                    if (!$value) {
                        continue;
                    }
                    $output[] = $this->getAttribute()->getSource()->getOptionText($value);
                }
                $output = implode(', ', $output);
                break;
        }

        return $output;
    }
}