Woo update cart

add_other_frgmet_to_update.php

<?php 
add_action('woocommerce_add_to_cart_fragments', function($fragments){
    $count = WC()->cart->get_cart_contents_count();
		ob_start(); ?>

		<span class="cart-value" <?php echo ($count == 0) ? 'style="display:none;"' : ''; ?>><?php echo $count ?></span>

	  <?php $fragments['span.cart-value'] = ob_get_clean();

		return $fragments;
});