Agregar shortcode y contador ajax al botón del carrito woocommerce

// Crear shortcode para el item del carrito de WooCommerce
add_shortcode ('ov_boton_carrito', 'ov_boton_carrito' );

function ov_boton_carrito() {
    ob_start();

        $cart_count = WC()->cart->cart_contents_count; // Variable del recuento del carrito

        ?>
        <li class="cart-sc"><a class="cart-contents" title="Mi carrito">
        <?php
        if ( $cart_count > 0 ) {
       ?>
            <span class="cart-contents-count"><?php echo $cart_count; ?></span>
        <?php
        }
        ?>
        </a></li>
        <?php

    return ob_get_clean();

}

// Agregar contador de productos mediante ajax
add_filter( 'woocommerce_add_to_cart_fragments', 'ov_carrito_contador' );
function ov_carrito_contador( $fragments ) {

    ob_start();

    $cart_count = WC()->cart->cart_contents_count;

    ?>
    <a class="cart-contents" title="<?php _e( 'Ver carrito de compras' ); ?>">
    <?php
    if ( $cart_count > 0 ) {
        ?>
        <span class="cart-contents-count"><?php echo $cart_count; ?></span>
        <?php
    }
        ?></a>
    <?php

    $fragments['a.cart-contents'] = ob_get_clean();

    return $fragments;
}