Display product tabs reviews with count

functions.php

<?php
/**
 * Override WooCommerce Hooks
 *
 * @package woocommerce-extends
 * @author Khoi Pro <khoi@chuyendev.com>
 * @since 0.0.1
 **/

add_filter('woocommerce_product_tabs', 'chuyendev_woocommerce_product_tabs');

/**
 * Override product tabs review title to display a correct count
 *
 **/
function chuyendev_woocommerce_product_tabs( $tabs ) {
	$comments = get_comment_count( get_the_ID() );

	if ( $comments['approved'] > 0 ) {
		$tabs['reviews']['title'] = sprintf( '%s (%d)', __('Reviews', 'woocommerce'), absint( $comments['approved'] ) );
	} else {
		$tabs['reviews']['title'] = __('Reviews', 'woocommerce');
	}

	return $tabs;
}