Shipping Rates based on Product Quantity on woocommerce

3 comments

1. You need to hook a function to woocommerce_calculate_totals action which is triggered right before calculating the final cart total. The woocommerce_calculate_totals action provides the WC_Cart instance, on which you can perform manipulation as per your requirement.

   add_action('woocommerce_calculate_totals', 'modify_shipping_totals');
   
   function modify_shipping_totals($cart) {
       if($cart->get_cart_contents_count() < 6) {
           $cart->shipping_total = ( 15/100 ) * $this->cart_contents_total; 
           // shipping cost will be 15% of cart content total
   
           // you may also want to modify the shipping tax.
   
           $cart->shipping_tax_total = 0; 
       } else {
           $cart->shipping_total = 6.99;
           $cart->shipping_tax_total = 0;
       }
   
   
   }
   

   For further reference regarding changable variables refer to WC_Cart documentation.

2. // **Note**: This code is working only when you set Flat rate Settings 
   // cost value is 1
   
   add_filter( 'woocommerce_package_rates', 'custom_package_rates', 10, 2 );
    function custom_package_rates( $rates, $packages ) {
       if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;
       $cart_count = WC()->cart->get_cart_contents_count();
       $cart_total =  WC()->cart->cart_contents_total;
   
       foreach($rates as $rate_key => $rate_values ) {
           $method_id = $rate_values->method_id;
           $rate_id = $rate_values->id;
   
           if( $method_id == 'flat_rate' ){
               if( $cart_count < 99 ){
                   $flat_rate_value = 4.95; //"Applay Flat rate less then 99 quatity"
                   $cart_10_percent = 0; // No percent discount
               }   
               if( $cart_count > 99 ){
                   $flat_rate_value = 9.95; // "Applay Flat rate greater then 99 quatity"
                   $cart_10_percent = 0; // No percent discount
               }
               $rate_cost = $flat_rate_value > $cart_10_percent ? $flat_rate_value - $cart_10_percent : 0;
   
               // Set the new calculated rate cost
               $rates[$rate_id]->cost = number_format( $rates[$rate_id]->cost * $rate_cost, 2 );
   
           }
       }
       return $rates;
   } 
   

3. The Pranav solution works if you call the add_action inside the init hook, like this:

   function init_shop(){
       add_action('woocommerce_calculate_totals', 'modify_shipping_totals', 10);
   }
   add_action( 'init', 'init_shop');
   

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