在Magento2中获取当前货币符号

如何在Magento2的.phtml文件中使用货币符号编写用于打印购物车总数的代码？

protected $_currency;

public function __construct(
    \Magento\Backend\Block\Template\Context $context,       
    \Magento\Directory\Model\Currency $currency,        
    array $data = []
)
{           
    $this->_currency = $currency;       
    parent::__construct($context, $data);
}

/**
 * Get currency symbol for current locale and currency code
 *
 * @return string
 */ 
public function getCurrentCurrencySymbol()
{
    return $this->_currency->getCurrencySymbol();
}