Code-Snippets-Functions/Execute a function on a child site/WooCommerce/add-thousand-separator-to-product-quantity.txt

function filter_woocommerce_checkout_cart_item_quantity( $item_qty, $cart_item, $cart_item_key ) {
    // Get quantity
    $cart_item_quantity = $cart_item['quantity'];
    
    // Format
    $cart_item_quantity = number_format($cart_item_quantity, 0, ',', ' ');
    
    // Output
    $item_qty = '<strong class="product-quantity">' . sprintf( '&times;&nbsp;%s', $cart_item_quantity ) . '</strong>';

    // Return
    return $item_qty;
}
add_filter( 'woocommerce_checkout_cart_item_quantity', 'filter_woocommerce_checkout_cart_item_quantity', 10, 3 );