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PHP Shopping Cart – Add to Cart using Session

Ahsan Zameer
PHP

In this tutorial we will learn add to cart using session in php. In my previous blog post I have created single product page. Now I am using same product page to apply add to cart feature. I will use php session for add to cart functionality. So let’s start.

HTML:

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   <form class="form-inline" method="POST">
                    <div class="form-group mb-2">
                        <input type="number" name="product_qty" id="productQty" class="form-control" placeholder="Quantity" min="1" max="1000" value="1">
                        <input type="hidden" name="product_id" value="<?php echo $getProductData['id']?>">
                    </div>
                    <div class="form-group mb-2 ml-2">
                        <button type="submit" class="btn btn-primary" name="add_to_cart" value="add to cart">Add to Cart</button>
                    </div>
                </form>
 

As you can see in above code that I have wrapped product quantity and cart button under form. I also make one hidden input field in which I am setting product id. Also form has POST method.

PHP:

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if(isset($_POST['add_to_cart']) &amp;&amp; $_POST['add_to_cart'] == 'add to cart')
    {
        $productID = intval($_POST['product_id']);
        $productQty = intval($_POST['product_qty']);
        
        $sql = "SELECT p.*,pdi.img from products p
            INNER JOIN product_images pdi ON pdi.product_id = p.id WHERE pdi.is_featured =:featured AND p.id =:productID";
 
        $prepare = $db-&gt;prepare($sql);
        
        $params = [
                ':featured'=&gt;1,
                ':productID' =&gt;$productID,
            ];
        
        $prepare-&gt;execute($params);
        $fetchProduct = $prepare-&gt;fetch(PDO::FETCH_ASSOC);
 
        $calculateTotalPrice = number_format($productQty * $fetchProduct['price'],2);
        
        $cartArray = [
            'product_id' =&gt;$productID,
            'qty' =&gt; $productQty,
            'product_name' =&gt;$fetchProduct['product_name'],
            'product_price' =&gt; $fetchProduct['price'],
            'total_price' =&gt; $calculateTotalPrice,
            'product_img' =&gt;$fetchProduct['img']
        ];
        
        if(isset($_SESSION['cart_items']) &amp;&amp; !empty($_SESSION['cart_items']))
        {
            $productIDs = [];
            foreach($_SESSION['cart_items'] as $cartKey =&gt; $cartItem)
            {
                $productIDs[] = $cartItem['product_id'];
                if($cartItem['product_id'] == $productID)
                {
                    $_SESSION['cart_items'][$cartKey]['qty'] = $productQty;
                    $_SESSION['cart_items'][$cartKey]['total_price'] = $calculateTotalPrice;
                    break;
                }
            }
 
            if(!in_array($productID,$productIDs))
            {
                $_SESSION['cart_items'][]= $cartArray;
            }
 
            $successMsg = true;
            
        }
        else
        {
            $_SESSION['cart_items'][]= $cartArray;
            $successMsg = true;
        }
 
    }
 

Above code start with a condition of form submit and then I wrote a sql query to get data of that product from database. After getting product data and save in $fetchProduct variable, I calculate the total price by multiplying quantity into product price. I also use number_format()function to show 2 digits after decimal sign. Next I created an array using $cartArray variable. Then I checked $_SESSION['cart_items'] condition to verify that current cart item is the first cart item or $_SESSION['cart_items'] already have cart items. If $_SESSION['cart_items'] is empty, then I add $cartArray to $_SESSION['cart_items'] . Otherwise I iterate $_SESSION['cart_items'] using foreach loop and match the current product is exist or not if current product is exist I will update its quantity and total price and break the loop. If current product is not present in $_SESSION['cart_items'] then I will add it in $_SESSION['cart_items']

Success Message:

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<?php if(isset($successMsg) && $successMsg == true){?>
            <div class="row mt-3">
                <div class="col-md-12">
                    <div class="alert alert-success alert-dismissible">
                         <button type="button" class="close" data-dismiss="alert">&times;</button>
                        <img src="<?php echo $imgUrl ?>" class="rounded img-thumbnail mr-2" style="width:40px;"><?php echo $getProductData['product_name']?> is added to cart. <a href="cart.php" class="alert-link">View Cart</a>
                    </div>
                </div>
            </div>
         <?php }?>
 

Once product will add and $successMsg will set, I will show success message.

Show Cart Item Count:

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<div class="form-inline my-2 my-lg-0">
                <a href="cart.php" style="color:#ffffff">
                    <i class="bi bi-cart4" style="font-size:30px;"></i>
                    <?php
                        echo (isset($_SESSION['cart_items']) && count($_SESSION['cart_items'])) > 0 ? count($_SESSION['cart_items']):'';
                    ?>
                </a>
            </div>
 

In above code I am just printing cart items count.

Also read:

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