PHP_Incomplete_Class as array

[Alexhoward]

Hi guys,

 

Really stuck here...

 

Found some shopping basket code, and i'm assuming it's in PHP4 or something.

 

Could someone please point me in the right direction?

 

i'm using some code found here:

http://whoyouknow.co.uk/php/shop/

 

however i'm getting the error in the title at this point :

 

switch($action) {
     
case "add":
$_SESSION['cart'][$product_id]++;
break;

 

Thanks in Advance!

[trq]

What error are you actually getting?

[Alexhoward]

Thanks Thorpe,

 

I'm getting the error in the title,

 

it's on the "$_SESSION['cart'][$product_id]++;" line

[trq]

You need to make sure that all the classes stored within the session array (ie; your cart object) are included prior to your call to session start.

[Alexhoward]

Hi,

 

thanks for the reply, but i don't really follow...

 

this is used in a shopping basket script, and therefore when the basket is empty surely nothing will be included...?

 

also couldn't there be any number of classes...?

 

cheers

[trq]

The cart object is stored within the $_SESSION array. You need to make sure the class definition for the cart object is in scope (included) prior to calling session_start(). eg;

 

<?php

  include 'cart.class.php';
  session_start();

  // its now safe to use $_SESSION and the cart object it may contain.

?>

[Alexhoward]

hi,

 

hold on.. it says something about hash tables, should i have a seperate file to save all this?

 

i though the session would save it?

 

sorry, but i'm now getting more errors...?

 

here's the whole lot... i sure i'm just being a numpty.

 

<?php

include 'cart.class.php';

session_start();

include("config.php");

//connect to the mysql server
$link = mysql_connect($host, $db, $pass)
or die ("Could not connect to mysql because ".mysql_error());

//select the database	
mysql_select_db($db)
or die ("Could not select database because ".mysql_error());


     $product_id = $_GET['id'];     //the product id from the URL 
     $action     = $_GET['action']; //the action from the URL 

     //function to check if a product exists
     function productExists($product_id) {
             //use sprintf to make sure that $product_id is inserted into the query as a number - to prevent SQL injection
             $sql = sprintf("SELECT id FROM products "); 
                 
             return mysql_num_rows(mysql_query($sql)) > 0;
     }

     //if there is an product_id and that product_id doesn't exist display an error message
     if($product_id && !productExists($product_id)) {
         die("Error. Product Doesn't Exist");
     }

     switch($action) {    //decide what to do    
     
         case "add":
             $_SESSION['cart'][$product_id] ++; //add one to the quantity of the product with id $product_id 
         break;
         
         case "remove":
             $_SESSION['cart'][$product_id]--; //remove one from the quantity of the product with id $product_id 
             if($_SESSION['cart'][$product_id] == 0) unset($_SESSION['cart'][$product_id]); //if the quantity is zero, remove it completely (using the 'unset' function) - otherwise is will show zero, then -1, -2 etc when the user keeps removing items. 
         break;
         
         case "empty":
             unset($_SESSION['cart']); //unset the whole cart, i.e. empty the cart. 
         break;
     
     }
     
?>

<?php    

     if($_SESSION['cart']) {    //if the cart isn't empty
         //show the cart
         
         echo "<table border=\"1\" padding=\"3\" width=\"40%\">";    //format the cart using a HTML table
         
             //iterate through the cart, the $product_id is the key and $quantity is the value
             foreach($_SESSION['cart'] as $product_id => $quantity) {    
                 
                 //get the name, description and price from the database - this will depend on your database implementation.
                 //use sprintf to make sure that $product_id is inserted into the query as a number - to prevent SQL injection
                 $sql = sprintf("SELECT name, description, price FROM php_shop_products WHERE id = %d;",
                                 $product_id); 
                     
                 $result = mysql_query($sql);
                     
                 //Only display the row if there is a product (though there should always be as we have already checked)
                 if(mysql_num_rows($result) > 0) {
                 
                     list($name, $description, $price) = mysql_fetch_row($result);
                 
                     $line_cost = $price * $quantity;        //work out the line cost
                     $total = $total + $line_cost;            //add to the total cost
                 
                     echo "<tr>";
                         //show this information in table cells
                         echo "<td align=\"center\">$name</td>";
                         //along with a 'remove' link next to the quantity - which links to this page, but with an action of remove, and the id of the current product
                         echo "<td align=\"center\">$quantity <a href=\"$_SERVER[php_SELF]?action=remove&id=$product_id\">X</a></td>";
                         echo "<td align=\"center\">$line_cost</td>";
                     
                     echo "</tr>";
                     
                 }
             
             }
             
             //show the total
             echo "<tr>";
                 echo "<td colspan=\"2\" align=\"right\">Total</td>";
                 echo "<td align=\"right\">$total</td>";
             echo "</tr>";
             
             //show the empty cart link - which links to this page, but with an action of empty. A simple bit of javascript in the onlick event of the link asks the user for confirmation
             echo "<tr>";
                 echo "<td colspan=\"3\" align=\"right\"><a href=\"$_SERVER[php_SELF]?action=empty\" onclick=\"return confirm('Are you sure?');\">Empty Cart</a></td>";
             echo "</tr>";        
         echo "</table>";
         
         
     
     }else{
         //otherwise tell the user they have no items in their cart
         echo "You have no items in your shopping cart.";
         
     } 
?>

 

i'm now getting the errors:

 

Warning: include(cart.class.php) [function.include]: failed to open stream: No such file or directory in E:\******\basket.php on line 3

 

Warning: include() [function.include]: Failed opening 'cart.class.php' for inclusion (include_path='.;C:\php5\pear') in E:\******\basket.php on line 3

 

Fatal error: Cannot use object of type __PHP_Incomplete_Class as array in E:\******\basket.php on line 37

 

Thanks for all the help

 

[trq]

is there actually a file called cart.class.php? I was just giving an example.

[Alexhoward]

haha,

 

oh right...

 

no there isn't...