TopDestinationCountries.php

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<?php
namespace Magento\Directory\Model;

use Magento\Store\Model\ScopeInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;

class TopDestinationCountries
{
    const CONFIG_DESTINATIONS_PATH = 'general/country/destinations';

    private $scopeConfig;

    public function __construct(ScopeConfigInterface $scopeConfig)
    {
        $this->scopeConfig = $scopeConfig;
    }

    public function getTopDestinations()
    {
        $destinations = (string)$this->scopeConfig->getValue(
            self::CONFIG_DESTINATIONS_PATH,
            ScopeInterface::SCOPE_STORE
        );
        return !empty($destinations) ? explode(',', $destinations) : [];
    }
}