/**
 * Define quantidade minima de compra
 */
function min_qtd_compra(){
    $cart = WC()->cart;
    $cart_total = 0;
    $cart_quantity = 0;
    $limit = 5; // limit
    foreach( $cart->get_cart() as $cart_item ){
        $cart_quantity += $item_qty; 
        $cart_total += $item_line_total; 
    }
    if ( $cart_total > intval( $limit ) ) {
        if( is_cart() ) {
            wc_print_notice( 
                sprintf( 'Your current order quantity total of %s is %s — the maximum quantity you can order is %s ', 
                    $product_name,
                    $product_number, 
                    $howmuch 
                ), 'error' 
            );
        } else {
            wc_add_notice( 
                sprintf( 'Your current order quantity total of %s is %s — the maximum quantity you can order is %s ', 
                    $product_name,
                    $product_number, 
                    $howmuch 
                ), 'error' 
            );
        }
    }
}
add_action( 'woocommerce_checkout_process', 'min_qtd_compra' );
add_action( 'woocommerce_before_cart', 'min_qtd_compra' );