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Welcome back.

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Now, what we need to do is that we need to calculate the total quantity of the cart and also the product

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quantity, the subtotal.

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So let's start with the subtotal.

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So in order to calculate the subtotal, we need to get the here.

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We need to get the product quantity and multiply it by the price.

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So here in this product price, we can here we have this price here and also it's being displayed here.

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So this is the single price and this is the the total subtotal, the total of a single day total of

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a one product multiplied by the number up by multiplying by the quantity.

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So here service playing 155 we need to say B2B and then we need, we need to multiply the weight to

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say echo and then we need to multiply the value product.

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Product quantity.

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By times the value.

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Product price.

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Product underscore price and then semicolon.

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No, forget the semicolon.

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Now, let me see and let me refresh and show you that.

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Now, this is going to be nine times 155 because a single a single product would cost to 155.

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A single pair of shoes would cost 155.

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But if you want to buy nine of these shoes, we need to I need to pay 155 multiplied by nine.

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So let me refresh let me go to the cart one more time.

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So if I go to the cart, I should say I should here to get 1395.

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So if you make the calculation, you will find that this is correct.

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Let me prove it to you so many years say to let me say here to if I say to and edit here the cost to

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the total cost out of a two shoes is 310.

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And that's correct because 155 plus 155 is equal to 310.

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So this is correct.

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Now let's work on the total product.

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So if I have many products, for example, if I have, let me go back and let me add let me go back

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to the homepage.

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Allow me add this product so this product would cost also, let me let me see look at that product because

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I want another price.

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So this one this one would cost 250.

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So if I click on buy now and add this product to cart, we have here 310 and here 250.

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But the total is static.

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So we need to work on that total.

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To work on the total we need to say we need to create a code a year.

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That's going to calculate the total.

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So I'm going to create here a function I'm going to here.

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Here.

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I'm going to give you the function.

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I'm going to say function and then I'm going to say calculate total.

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Can't.

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And then I'm going out in order to get the total, we need to say we need to look over to the station.

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So I'm going to say for each session.

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Session cart and then we to get each single product.

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So we need to say what we need to say for each thing.

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Session, cart.

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As key.

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Value.

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Key.

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Value and then we need to get each single product.

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So each single product in order to get each single product, we need to say session and then.

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And then.

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And then key.

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Key.

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This is going to return the array of each single product so we can say here product.

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So for each single product, what we want to get is that we want to get we need to say we need to get

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the the price as well as the quantity.

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So this is going to return an array and each time it's going to return a different product.

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So for each different product, for each different for each different product, we need to get the product.

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Price and quantity.

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So I'm going to get the price.

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I'm going to get here.

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Price.

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And quantity.

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Quantity.

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So the quantity is going to be equal to your product, product, product, quantity, quantity.

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And then we need to multiply the price by the quantity.

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So we need to say total is equal to price, price multiplied by the quantity.

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However, this is going to return only one total of one product.

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Therefore, we need to create a variable called total and it's going to be initially zero.

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And then we need to say total is equal to total, total plus price multiplied by the quantity.

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So what this what this is going to do is that each time it is going to increase the each time it's going

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to increase the it's going to add the old total to the new total.

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So it's going to give the all total.

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And each time we have a product, we are going to get the price multiplied by the quantity and adding

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to the total.

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And here, by the way, I should say total and finally we can here say return.

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Finally return.

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Return what?

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To return the total.

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Or better.

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Instead of returning, we need to store this in indecision.

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So I'm going to get here in decision.

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I'm going to create a new key called Doctor.

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Doctor.

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I'm going to say Doctor Total now is going to be equal to doctor.

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That's it.

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Now we need to call this function so we.

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When should we call this function?

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We should call this function each time we add a product to the cart.

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So we need to call the address inside.

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Inside, add to cart.

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So inside this add to cart.

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Inside this add to cart here.

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Hearing to say update or calculate total.

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So here I'm going to say calculate total.

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Calculate total carte.

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Finally, we need to display the total here in the bottom.

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In the bottom, we need to say.

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We need to say here.

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You remember this first part?

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This table in this table.

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So in this table, we don't need actually this subtotal because we don't have I didn't add any other

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costs.

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So I am going to remove this subtotal.

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Subtotal, we just need the total.

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So the total, instead of saying, I want 55, I'm going to remove it and then I'm going to say BHP

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and then I'm going to use this session.

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I'm going to say Session.

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Total.

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And of course, we need to say echo.

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Echo.

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Total session.

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Total.

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Let me now save and let me refresh.

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So here, as you can see, what I'm going to get is that I'm going to get 560.

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So let's make it a calculation together.

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Is 310 plus 200, 250 is equal to 560.

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Well, that's correct.

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Let me prove it to you.

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Link will prove that this is correct, that the total DOT three total has been calculated correctly

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leaving here the number of products and limit click on edit.

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And if you click on edit now the total is still here.

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The reason why it's still 560 is because actually I need to call.

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I need to call the calculate.

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Also here.

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I need to call it here.

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In the in case we update, in case we update or in case we remove.

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So here in case we remove something foreign because we need to calculate return to calculate total.

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And also in case in case we update in case we update the quantity we need here to calculate total calculated.

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Let me try one more time.

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So now if I refresh.

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Now the total as you can see, the total is 810 linear decrease.

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This one more time I'm going to say one and edit.

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And now they total again back to a 560 limit increase this to two and then update.

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And as you can see, the total now is 810.

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If I increase this to three and update, as you can see now, the total is four 965.

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So now the total worked successfully and now we have the total total amount.

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So this is the single price of this is the subtotal and this is the total.