WooCommerce conditional shipping methods based on cart contents weight

conditional-shipping.php

/** 
 * Shipping based on cart contents weight
 */
add_filter( 'woocommerce_cart_shipping_packages', 'ps_woocommerce_cart_shipping_packages_by_weight' );

function ps_woocommerce_cart_shipping_packages_by_weight( $packages ) {

    $packages = array();
 
  
    $cart_items = WC()->cart->get_cart(); 
   
   if( WC()->cart->cart_contents_weight > 4){
        $packages[] = array(
            'ship_via' => array( 'ups'  ), /*Shipping methods that are available for order over 4 lbs */
            'contents' => $cart_items,
            'contents_cost' => array_sum( wp_list_pluck( $cart_items, 'line_total' ) ),
            'applied_coupons' => WC()->cart->applied_coupons,
            'destination' => array(
                'country' => WC()->customer->get_shipping_country(),
                'state' => WC()->customer->get_shipping_state(),
                'postcode' => WC()->customer->get_shipping_postcode(),
                'city' => WC()->customer->get_shipping_city(),
                'address' => WC()->customer->get_shipping_address(),
                'address_2' => WC()->customer->get_shipping_address_2()
            )
        );
    }else{
       $packages[] = array(
            'ship_via' => array('usps'), /*Shipping methods that are available for order under 4 lbs */
            'contents' => $cart_items,
            'contents_cost' => array_sum( wp_list_pluck( $cart_items, 'line_total' ) ),
            'applied_coupons' => WC()->cart->applied_coupons,
            'destination' => array(
                'country' => WC()->customer->get_shipping_country(),
                'state' => WC()->customer->get_shipping_state(),
                'postcode' => WC()->customer->get_shipping_postcode(),
                'city' => WC()->customer->get_shipping_city(),
                'address' => WC()->customer->get_shipping_address(),
                'address_2' => WC()->customer->get_shipping_address_2()
            )
        ); 
    }
      
    return $packages;
}

weight-class-shipping.php

/** 
 * Shipping based on cart contents weight and shipping class. Allow for multiple shipping
 * types in one cart.
 */
add_filter( 'woocommerce_cart_shipping_packages', 'ps_woocommerce_cart_shipping_packages_by_weight' );

function ps_woocommerce_cart_shipping_packages_by_weight( $packages ) {

    $packages = array();
 
  
    $free_items = array();
    $regular_items = array();
 
    // Sort rack from regular
    foreach ($regular_items  WC()->cart->get_cart() as $item ) {
        if ( $item['data']->needs_shipping() ) {
            if ( $item['data']->get_shipping_class() == 'free-shipping' ) {
                $free_items[] = $item;
            } else {
                $regular_items[] = $item;
            }
        }
    }

   if ( $free_items ) {
        $packages[] = array(
            'ship_via' => array( 'free_shipping'  ),
            'contents' => $free_items,
            'contents_cost' => array_sum( wp_list_pluck( $free_items, 'line_total' ) ),
            'applied_coupons' => WC()->cart->applied_coupons,
            'destination' => array(
                'country' => WC()->customer->get_shipping_country(),
                'state' => WC()->customer->get_shipping_state(),
                'postcode' => WC()->customer->get_shipping_postcode(),
                'city' => WC()->customer->get_shipping_city(),
                'address' => WC()->customer->get_shipping_address(),
                'address_2' => WC()->customer->get_shipping_address_2()
            )
        );
    }

    if( $regular_items && WC()->cart->cart_contents_weight > 4){
        $packages[] = array(
            'ship_via' => array( 'ups'  ), /*Shipping methods that are available for order over 4 lbs */
            'contents' => $regular_items,
            'contents_cost' => array_sum( wp_list_pluck( $regular_items, 'line_total' ) ),
            'applied_coupons' => WC()->cart->applied_coupons,
            'destination' => array(
                'country' => WC()->customer->get_shipping_country(),
                'state' => WC()->customer->get_shipping_state(),
                'postcode' => WC()->customer->get_shipping_postcode(),
                'city' => WC()->customer->get_shipping_city(),
                'address' => WC()->customer->get_shipping_address(),
                'address_2' => WC()->customer->get_shipping_address_2()
            )
        );
    }elseif ($regular_items){
       $packages[] = array(
            'ship_via' => array('usps'), /*Shipping methods that are available for order under 4 lbs */
            'contents' => $regular_items,
            'contents_cost' => array_sum( wp_list_pluck( $regular_items, 'line_total' ) ),
            'applied_coupons' => WC()->cart->applied_coupons,
            'destination' => array(
                'country' => WC()->customer->get_shipping_country(),
                'state' => WC()->customer->get_shipping_state(),
                'postcode' => WC()->customer->get_shipping_postcode(),
                'city' => WC()->customer->get_shipping_city(),
                'address' => WC()->customer->get_shipping_address(),
                'address_2' => WC()->customer->get_shipping_address_2()
            )
        ); 
    }
      
    return $packages;
}