How to Change Price of Specific Product and Quantity in Cart?

Sometimes, we want to recalculate the price of a specific product, which we have already added to the cart.
So, here we will use woocommerce_before_calculate_totals hook to recalculate the price before set the totals of cart.

If you want to change the price of a specific product in the cart depending on the condition then I’ll show you an easy method to do this. You can use woocommerce_before_calculate_totals hook. You can learn more about action hook here.

This hook will run before calculating the total of all cart item prices. And will do modification the final total with our custom price of the specific product.

Set custom price for all products:

Look at the example:

<?php
	add_action( 'woocommerce_before_calculate_totals', 'codedocx_recalculate_price' );
 
	function codedocx_recalculate_price( $cart_object ) {
		foreach ( $cart_object->get_cart() as $hash => $value ) {
			$value['data']->set_price( 10 );
		}
	}	
?>

The above example is to set the custom price for all products.

Set Custom Price for Specific Products:

Next, we will learn how we can set the custom price of specific products and also with specific conditions.

When customers will add the product of a specific category (ID: 926) in the cart with a certain amount (e.g 5), so this product category will receive a 45% discount but it will not affect the price of other categories of products.

Look at this example:

<?php
	add_action( 'woocommerce_before_calculate_totals', 'codedocx_recalculate_price' );
	 
	function codedocx_recalculate_price( $cart_object ) {
	 
		if ( is_admin() && ! defined( 'DOING_AJAX' ) )
			return;
	 
		$quantity = 0;
	 
		foreach ( $cart_object->get_cart() as $key => $value ) {
	 
			if( in_array( 926, $value['data']->get_category_ids() ) && $value['product_id'] != 112233 ) {
	 
				$quantity += $value['quantity'];
	 
			}

		}
	 
		// change price of specific product
		if( $quantity > 5 ) {
			foreach ( $cart_object->get_cart() as $key => $value ) {
	 
				// discounts only for products in category with ID 926
				// Not discount for the product with ID 112233
				if( in_array( 926, $value['data']->get_category_ids() ) && $value['product_id'] != 112233 ) {
	 
					$new_price = ($value['data']->get_regular_price() * 45) / 100;
	 
					if( $value['data']->get_sale_price() > $new_price )
						$value['data']->set_price( $new_price );
	 
				}
	 
			}
		}
	 
	}	
?>

Explanation: In the above example, first, we count the quantity of a specific product category in the cart item, and then we checked that the quantity is greater than 5 to give a 45% discount on that specific category’s product.

So, If the quantity will be more than 5 then applied the discount of 45% in the cart for those products.