How to remove existing values in array session using PHP? - php

Question

Can you help me with my code. I am creating a super simple shopping cart that can add cart/update and remove. But as for now what I already did is the add to cart and the displaying of items. But I have an error. Everytime I refresh the page the session is automatically appending to the session array.
Now what I need to do is this.
Validate if the product is in the session list. If not create a session for that if yes just skip it.
And for the additional question. How can I create an update/remove function?
Here's my code so far. This process is only 1 PHP file.
$category = $_GET['cat'];
$product_id = $_GET['product'];
//fn_print_r($_SESSION);
//unset($_SESSION['cart']);
$product_detail = get_allproduct_detail($product_id);
$prod_price = $product_detail['prod_price'];
$sale_price = $product_detail['sale_price'];
$prod_type = $product_detail['prod_type'];
if(!empty($_POST['product_id']) && !empty($_POST['product_name']) && !empty($_POST['product_price']) && !empty($_POST['sale_price']) && !empty($_POST['qty'])) {
$sess_id = $_POST['product_id'];
$sess_name = $_POST['product_name'];
$sess_price = $_POST['product_price'];
$sess_sale_price = $_POST['sale_price'];
$sess_qty = $_POST['qty'];
$compute_total = $sess_sale_price * $sess_qty;
$cart_row = array(
'product_id' => $sess_id,
'product_name' => $sess_name,
'product_price' => $sess_price,
'sale_price' => $sess_sale_price,
'qty' => $sess_qty,
'total' => $compute_total
);
if(!isset($_SESSION['cart'])){
$_SESSION['cart'] = array();
}
$_SESSION['cart'][] = $cart_row;
//fn_print_r($_SESSION);
}
Here's the form process
<form method="POST" action="?page=product&cat=<?php echo $_GET['cat']; ?>&product=<?php echo $_GET['product']; ?>" onsubmit="">
<div id="item_detail_right">
<label>Qty:<input type="text" name="qty" value="1" size="5" style="text-align: center" />
<input type="hidden" name="product_price" id="product_price" value="<?php echo $prod_price; ?>" />
<input type="hidden" name="sale_price" id="sale_price" value="<?php echo $sale_price; ?>" />
<input type="hidden" name="product_id" id="product_id" value="<?php echo $_GET['product']; ?>" />
<input type="hidden" name="product_name" id="product_name" value="<?php echo strtoupper(get_product_name($_GET['product'])); ?>" />
<input type="submit" value="+CART" />
<input type="button" value="+Wishlist" id="mywishlist" data-wishlist-id="<?php echo $_GET['product']; ?>" />
</div>
</form>
Here's the display of cart
if(!isset($_SESSION['cart']) || (count($_SESSION['cart']) == 0)) {
echo "<p>Your cart is empty</p>";
} else {
echo "<table border='0' style='font-size: 12px; width: 100%' cellpadding='5'>";
echo "<tr>";
echo "<td style='background-color: white; color: black; text-align: center'>Product ID</td>";
echo "<td style='background-color: white; color: black; text-align: center'>Name</td>";
echo "<td style='background-color: white; color: black; text-align: center'>Price</td>";
echo "<td style='background-color: white; color: black; text-align: center'>Sale Price</td>";
echo "<td style='background-color: white; color: black; text-align: center'>Quantity</td>";
echo "<td style='background-color: white; color: black; text-align: center'>Total</td>";
echo "<td style='background-color: white; color: black; text-align: center'></td>";
echo "</tr>";
$total = 0;
foreach($_SESSION['cart'] as $item) {
echo "<tr>";
echo "<td style='text-align: center; background-color: gray; color: black'>".$item['product_id']."</td>";
echo "<td style='text-align: left; background-color: gray; color: black'>".$item['product_name']."</td>";
echo "<td style='text-align: right; background-color: gray; color: black'>".number_format($item['product_price'],2)."</td>";
echo "<td style='text-align: right; background-color: gray; color: black'>".number_format($item['sale_price'],2)."</td>";
echo "<td style='text-align: center; background-color: gray; color: black'><input type='text' name='cart_qty[]' value='".$item['qty']."' size='10' style='text-align: center'></td>";
echo "<td style='text-align: right; background-color: gray; color: black'>".number_format($item['total'],2)."</td>";
echo "<td style='text-align: center; background-color: gray; color: black'><a href='#'>Update this?</a> | <a href='#'>Remove this?</div></td>"; //how can I use this to remove and update the session?
echo "</tr>";
$total += ($item['sale_price'] * $item['qty']);
}
echo "<tr>";
echo "<td colspan='7' style='text-align: right'>";
echo "<label>Subtotal Amount: </label><input type='text' name='subtotal' value='".number_format($total,2)."' readonly='readonly'>";
echo "<input type='submit' value='Place Item' />";
echo "</td>";
echo "</tr>";
echo "</table>";
}
Here's my sample output of array
Array
(
[visit] => nsrAROum86lb8VK
[slideshow] => 04-15-14
[cart] => Array
(
[0] => Array
(
[product_id] => 1
[product_name] => AJNA
[product_price] => 90
[sale_price] => 81
[qty] => 1
[total] => 81
)
[1] => Array
(
[product_id] => 1
[product_name] => AJNA
[product_price] => 90
[sale_price] => 81
[qty] => 1
[total] => 81
)
[2] => Array
(
[product_id] => 1
[product_name] => AJNA
[product_price] => 90
[sale_price] => 81
[qty] => 1
[total] => 81
)
[3] => Array
(
[product_id] => 1
[product_name] => AJNA
[product_price] => 90
[sale_price] => 81
[qty] => 1
[total] => 81
)
)
)
i uploaded my whole code to this link
http://www.mediafire.com/view/g6jah2bxbzda04l/aroma_shop.php

Answer 1

You can check wether the product is already in the cart.
if(!isset($_SESSION['cart'])){
$_SESSION['cart'] = array();
}
// Instead of appending $cart_row immediately,
// $_SESSION['cart'][] = $cart_row;
// only add the $cart_row which has not been added previously
$found = false;
foreach ($_SESSION['cart'] as $c) {
if ($c['product_id'] == $cart_row['product_id']) {
$found = true;
}
}
if (!$found) {
$_SESSION['cart'][] = $cart_row;
}