CookieDomainValidator.php

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<?php
namespace Magento\Framework\Session\Config\Validator;

class CookieDomainValidator extends \Magento\Framework\Validator\AbstractValidator
{
    public function isValid($value)
    {
        $this->_clearMessages();
        if (!is_string($value)) {
            $this->_addMessages(['must be a string']);
            return false;
        }

        $validator = new \Zend\Validator\Hostname(\Zend\Validator\Hostname::ALLOW_ALL);

        if (!empty($value) && !$validator->isValid($value)) {
            $this->_addMessages($validator->getMessages());
            return false;
        }
        return true;
    }
}