Project structure is as follows:
A home page (store_home1.php) which lists various products and links user to a products page using GET method .
A products page (product.php) which shows the user more detail and links them to the shopping
cart page via ADD TO CART submit button using POST method.
Shopping cart page (cart.php) which uses a $variable to echo a table that displays products added to cart.
I am working with a shopping cart script and having trouble [COLOR="#FF0000"]increasing quantity[/COLOR] in the cart.If the user selects a product and clicks ADD TO CART , that product is added to the cart and the qty shows 1. It does not matter which product the user chooses to add to the cart.
If the user uses the browser back button to return to the product page or home page and attempts to add the product again the cart page shows the following:Notice: Undefined index: quantity inC:\xampp\htdocs\tutorials\kensStore\cart.phpon line*70
Notice: Undefined index: quantity inC:\xampp\htdocs\tutorials\kensStore\cart.phpon line*76
and the qty in the cart display changes from 1 to 0.
Is there a problem with a problem with the array_splice on line 29 that changes “quantity” key value to $each_item['quantity'] ?Line 29:
array_splice ($_SESSION["cart_array"], $i-1,1, array(array("item_id"=>$pid,"quantity"=> [COLOR="#FF0000"]$each_item['quantity'][/COLOR]+1)));Or is there some kind of session persistence problem because the user has to use browser back button?
Either way, I don't know how to correct this.
The problem referenced lines 70 & 76 are in section 3 of this code.
70: $priceTotal = $price * $each_item['quantity'];
76:$cartOutput .= "<td>" .$each_item['quantity']. "</td>";
If you require additional info let me know.
Or require code for the other pages.
<?php
session_start();
?>
<?php
include "conn_to_mysqli.php";
?>
<?php
///////////////////////////////////////////////////////////////////////////////
//Section 1 (check for items in cart, adjust quantities , or add items to cart)
///////////////////////////////////////////////////////////////////////////////
if (isset($_POST ['pid'])) {
$pid = $_POST ['pid'];
$wasFound = false;
$i = 0; //this represents the index of the array
//check the cart session variable is not set or the cart array is empty
if (!isset ($_SESSION["cart_array"]) || count($_SESSION ["cart_array"])<1){
//run if the cart is not set or empty
$_SESSION["cart_array"] = array (1=> array("item_id"=> $pid, "quantity" => 1));
} else {
// run if the cart has at least one item
foreach ($_SESSION["cart_array"] as $each_item) {
$i++; //holds a numeric representation of which associative array of our multidemensional array is passing through the loop
while(list($key,$value)=each($each_item)){
if ($key== "item_id" && $value == $pid) {
//the above if statement is how you find the match to the item already in cart
//that item is already in the cart so adjust quantity using array_splice
//array splice removes a portion of an array and replaces it with something else
array_splice ($_SESSION["cart_array"], $i-1,1, array(array("item_id"=>$pid,"quaniity"=> $each_item['quantity']+1)));
$wasFound = true;
}//close if condition
}//close while loop
}// close foreach loop
if($wasFound==false) {
//so if this item isn't already in the cart it puts it in the cart
//array_push puts new associative array into your multi dimensional array. Remember pic ?
array_push ($_SESSION["cart_array"], array("item_id"=> $pid, "quantity" => 1));
}
}
}
?>
<?php
////////////////////////////////////////////////////////////////
//Section 2 (if the user chooses to empty their shopping cart )
///////////////////////////////////////////////////////////////
if(isset($_GET['cmd']) && $_GET['cmd']=="emptycart") {
unset($_SESSION["cart_array"]);
}
?>
<?php
///////////////////////////////////////////////////
//Section 3 (render the cart for the user to view)
//////////////////////////////////////////////////
$cartOutput ="";
if(!isset($_SESSION["cart_array"]) || count($_SESSION["cart_array"])<1) {
$cartOutput = "<h2 align='center'> Your shopping cart is empty</H2>";
} else {
$i = 0;
foreach($_SESSION["cart_array"] as $each_item) {
$i++;
$item_id = $each_item['item_id'];
$sql = mysqli_query($con, "SELECT * FROM products WHERE id = '{$item_id}'LIMIT 1");
while ($row = mysqli_fetch_array($sql)) {
$product_name = $row['product_name'];
$price = $row['price'];
$details = $row['details'];
}
$priceTotal = $price * $each_item['quantity'];
//dynamic table row assembly
$cartOutput .= "<tr>";
$cartOutput .= "<td>" .$product_name. "<br/><img src=\"store_admin/inventory_images/$item_id.jpg\" alt=\"product_name\" width=\"48\" height=\"48\"/></td>";
$cartOutput .= "<td>" .$details. "</td>";
$cartOutput .= "<td>" .$price. "</td>";
$cartOutput .= "<td>" .$each_item['quantity']. "</td>";
$cartOutput .= "<td>" .$priceTotal. "</td>";
$cartOutput .= "<td> X </td>";
$cartOutput .= "</tr>";
echo $priceTotal;
echo var_dump($priceTotal);
}
}
?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>Your Cart</title>
<link rel="stylesheet" type="text/css" href="product.css" >
</head>
<body>
<div id="pagewrap" >
<div id="pageHeader"><h1>Sunrise Side Sporting Goods<h1>
<p align="center"><a href="cart.php"> <img src="style/shop-cart-check.png" width="64" height="64" /> Your Cart</a></p>
<nav id="top_nav">
<ul>
<li><a class="topLinks" href="store_home1.php">Home</a></li>
<li><a class="topLinks" href="">link2</a></li>
<li><a class="topLinks" href="">link3</a></li>
<li><a class="topLinks" href="">link4</a></li>
<li><a class="topLinks" href="">link5</a></li>
<li><a class="topLinks" href="">link6</a></li>
</ul>
</nav>
</div>
<section id="middle">
<h2><center>Welcome to Your Cart</center></h2>
<table width="100%" border="1" cellpadding="3">
<tr id="row1" name="row1">
<td width="20%" style="background: blue; color: white;"> Product</td>
<td width="40%" style="background: black; color: #00FF00;"> Product Details</td>
<td width="10%" style="background: black; color: #00FF00;"> unit price</td>
<td width="10%" style="background: black; color: #00FF00;"> Qty</td>
<td width="10%" style="background: black; color: #00FF00;"> $ Total</td>
<td width="10%" style="background: black; color: #00FF00;"> Remove</td>
</tr>
<?php echo $cartOutput; ?>
</table>
<br><br>
<p><a href="cart.php?cmd=emptycart"> <img src="style/Shop-cart-exclude.ico" width="64" height="64" /> Click Here to Empty Your Cart</a></p>
<p align="right"> <a href="store_home1.php" target="_blank"> Continue Shopping</a></p>
</section>
<aside id="sidebar">
<h2>3rd Content Area</h2>
<p>This is some text in a paragraph</p>
<p>This is some more text in annother paragraph</p>
<p>This is even more text in yet annother paragraph </p>
</aside>
<footer>
<h4>Footer</h4>
<p>Footer text</p>
</footer>
</div>
</body>
</html>
<div id="pageFooter"> Footer </div>
</div>
</body>
</html>
