CurrencyDisplayOptions.php

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<?php
namespace Magento\CurrencySymbol\Observer;

use Magento\Framework\Locale\Currency;
use Magento\Framework\Event\ObserverInterface;

class CurrencyDisplayOptions implements ObserverInterface
{
    protected $symbolFactory;

    public function __construct(\Magento\CurrencySymbol\Model\System\CurrencysymbolFactory $symbolFactory)
    {
        $this->symbolFactory = $symbolFactory;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $baseCode = $observer->getEvent()->getBaseCode();
        $currencyOptions = $observer->getEvent()->getCurrencyOptions();
        $currencyOptions->addData($this->getCurrencyOptions($baseCode));

        return $this;
    }

    protected function getCurrencyOptions($baseCode)
    {
        $currencyOptions = [];
        if ($baseCode) {
            $customCurrencySymbol = $this->symbolFactory->create()->getCurrencySymbol($baseCode);
            if ($customCurrencySymbol) {
                $currencyOptions[Currency::CURRENCY_OPTION_SYMBOL] = $customCurrencySymbol;
                $currencyOptions[Currency::CURRENCY_OPTION_DISPLAY] = \Magento\Framework\Currency::USE_SYMBOL;
            }
        }

        return $currencyOptions;
    }
}