Magento 2 Get Cart Quote Total in minicart.phtml

You have to just keep below line in your minicart.phtml file to get updated subtotal ,

This Below line is workig for all cases if cache is enable its working fine,

<span data-bind="html: getCartParam('subtotal')"></span> 

For getting value of grandtotal,shipping rate,

You can get GrandTotal, subtotal and shipping rate for current quote using below code in minicart.phtml file, But when cache is enable at that time not update price when you add new product using below method.

<?php
    $quote = $block->getTotalsCache();
    $getSubTotal = $quote['subtotal']->getData('value');
    $getGrandTotal = $quote['grand_total']->getData('value');
    $getShippingRate = $quote['shipping']->getData('value');

        $finalSubTotal = $this->helper('Magento\Framework\Pricing\Helper\Data')->currency(number_format($getSubTotal,2),true,false);
        $finalShippingTotal = $this->helper('Magento\Framework\Pricing\Helper\Data')->currency(number_format($getShippingRate,2),true,false);
        $finalGrandTotal = $this->helper('Magento\Framework\Pricing\Helper\Data')->currency(number_format($getGrandTotal,2),true,false);
?>

We had a similar question from a client. where he wanted to show "[quantity] item [subtotal]" in a styled cart block instead of the default cart icon in the minicart.

We found this question here but didn't like the answer where we needed to extend the \Magento\Checkout\CustomerData\Cart class just to render some html correctly

this is the code how we fixed it in the template:

<span class="counter-label">
    <!-- ko if: getCartParam('summary_count') == 1 -->
        <!-- ko text: getCartParam('summary_count') --><!-- /ko -->
        <!-- ko i18n: 'item' --><!-- /ko -->
        <span data-bind="html: getCartParam('subtotal')"></span>
    <!-- /ko -->
    <!-- ko if: getCartParam('summary_count') != 1 -->
        <!-- ko text: getCartParam('summary_count') --><!-- /ko -->
        <!-- ko i18n: 'items' --><!-- /ko -->
        <span data-bind="html: getCartParam('subtotal')"></span>
    <!-- /ko -->
</span>

It seems like you can also use the standard knockout.js data binding and don't persé need to use the crazy magento 2 knockout comment method. this solved the problem where rendering the getCartParam('subtotal') with the html method where it would normally print the subtotal incorrectly due to the <span ="price"></span> tag

This above code will works on the page load, but will not work with magento2 ajax add to cart as it uses Knockout JS now.

For that you should use -

1. Override the magento class "\Magento\Checkout\CustomerData\Cart" in your module and extend method "getSectionData"
   

    public function getSectionData()
    {
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // Instance of Object Manager
        $priceHelper = $objectManager->create('Magento\Framework\Pricing\Helper\Data'); // Instance of Pricing Helper

        $totals = $this->getQuote()->getTotals();
        return [
            'summary_count' => $this->getSummaryCount(),
            'subtotal' => isset($totals['subtotal'])
                ? $this->checkoutHelper->formatPrice($totals['subtotal']->getValue())
                : 0,
            'subtotal_value' => isset($totals['subtotal'])
                ? $priceHelper->currency($totals['subtotal']->getValue(),true,false)
                : '',
            'possible_onepage_checkout' => $this->isPossibleOnepageCheckout(),
            'items' => $this->getRecentItems(),
            'extra_actions' => $this->layout->createBlock('Magento\Catalog\Block\ShortcutButtons')->toHtml(),
            'isGuestCheckoutAllowed' => $this->isGuestCheckoutAllowed(),
        ];
    }

Here I have added a new cart param "subtotal_value" as the "subtotal" will return the price container span and it will display as TEXT using KO. Here you have to use "Object Manager Instance" directly, as you wont be able to inject dependencies to the "__construct".

NOTE, there are few exception where we might need to use "Object Manager Instance" directly. In our case it is backward compatibility of constructor.
ObjectManager Exception

2. Next, copy magento default theme "/cart/minicart.phtml" to your theme and add the KO codes.

   ko text: getCartParam('subtotal_value')